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Vidyamandir Classes

DATE :

MARKS : 10

IITJEE :

NAME :

TIME : 25 MINUTES

TEST CODE : G Laws [1]

ROLL NO.

START TIME :

END TIME :

STUDENT’S SIGNATURE :

TIME TAKEN:

PARENT’S SIGNATURE :

This test contains a total of 10 Objective Type Questions. Each question carries 1 mark. There is NO NEGATIVE marking. Choose the correct alternative. Only one choice is correct. 1.

Which description best fits a ideal gas ? (A) Definite shape and volume ; strong intermolecular attractions (B) Definite volume ; shape of container ; moderate intermolecular attractions (C) Definite volume ; shape of container ; weak intermolecular attractions (D) Volume and shape of container ; no intermolecular attractions

2.

The comparing gases with liquids, gases have … compressibility and … density. (A) greater ; smaller (B) greater ; greater (C) smaller ; smaller

3.

4.

5.

Which represents the largest pressure ? (A) One atmosphere (C) One mm of Hg

smaller ; greater

Five pounds per square inch One hundred Pascal

Which pair of molecules has the strongest dipole – dipole interactions ? (A) (B) (C) NH 3 and CH 4 NH 3 and NH 3 CH 4 and CH 4

(D)

CO 2 and CO 2

What weight of hydrogen at STP could be contained in a vessel that holds 3.36 L O2 gas at STP ? (A)

6.

(B) (D)

(D)

0.21 g

(B)

4.8 g

(C)

0.30 g

(D)

3.36 g

The VD of gas is 11.2. The volume occupied by 11.2g of this gas at NTP is : (A) 22.4 L (B) 11.2 L (C) 1 L

(D)

2.2 L

7.

What will be the new volume when 128 mL of gas at 20.0C is heated to 40C while pressure remains unchanged ? (A) 64.0 mL (B) 120 mL (C) 128 mL (D) 137mL

8.

A sealed container with gas at 2.00 atm is heated from 20.0 K to 40.0 K. The new pressure is : (A) 0.050 atm (B) 1.00 atm (C) 4.00 atm (D)

2.14 atm

The relative rate of diffusion of a gas (molar mass = 128) as compare to oxygen is : (A) 2 times (B) 1/4 (C) 1/8

1/2

9.

10.

(D)

If 4 g of oxygen diffuse through a very narrow hole, how much hydrogen would have diffused under identical conditions ? (A) 16 g (B) 1g (C) 1/4 g (D) 64 g

VMC/Gas Laws

22

HWT/Chemistry

Vidyamandir Classes

DATE :

MARKS : 10

IITJEE :

NAME :

TIME : 25 MINUTES

TEST CODE : G Laws [2]

ROLL NO.

START TIME :

END TIME :

STUDENT’S SIGNATURE :

TIME TAKEN:

PARENT’S SIGNATURE :

This test contains a total of 10 Objective Type Questions. Each question carries 1 mark. There is NO NEGATIVE marking. Choose the correct alternative. Only one choice is correct. 1.

A gas at a pressure of 5.0 atm is heated from 0 to 546C and is simultaneously compressed to one-third of its original volume. Hence final pressure is : 5 atm 9 “The total pressure exerted by a number of non-reacting gases is equal to the sum of partial pressure of the gaseous under the same conditions”. It is known as : (A) Bolye’s law (B) Charles’ law (C) Avogadro’s law (D) Dalton’s law

(A) 2.

15.0 atm

(B)

30.0 atm

(C)

45.0 atm

(D)

3.

For an ideal gas which of the following graphs will not be straight line when all the other variables are held constant ? 1 P vs (A) P vs T (B) V vs T (C) (D) n vs T V

4.

1g H 2 2g He and 3g NO are contained in 1.1 L flask at 300 K. Total pressure exerted by the mixture is : (A)

5.

5.45 atm

(B)

6.0 atm

(C)

24.63 atm

(D)

At the same temperature and pressure which of the following gas will have highest KE per mol ? (A) H2 (B) O2 (C) CH4 (D)

134.34 atm equal

6.

At what temperature will the total KE of 0.30 mol of He be the same as the total KE of 0.40 mol Ar at 400 K ? (A) 533 K (B) 400 K (C) 346 K (D) 300 K

7.

The molecular velocities of two gases at same temperature are u 1 and u2, their molar mass are m1 and m2 respectively. Which of the following expression is correct ? m1 m 2 m1 m 2 (A) (B) (C) 2 (D) m1u12 m 2 u 22 m1u1 m 2 u 2 2 u1 u2 u1 u2

8.

50 mL of H2 gas diffuses through a small hole from a vessel in 20 minutes. Time taken by 40 mL of O2 gas to diffuse under similar conditions will be : (A) 12 min (B) 64 min (C) 8 min (D) 32 min

9.

The average molecular speed is greatest in which of the following gas samples ? (A) 1.0 mol of O2 at 560 K (B) 0.50 mol of Ne at 500 K (C) 0.20 mol of CO2 at 440 K (D) 2.0 mol of He at 140 K

10.

The average kinetic energy of an ideal gas per molecule in SI unit at 25C will be : (A)

VMC/Gas Laws

6.17 1021 kJ

(B)

6.17 1021 J

(C)

23

6.17 1020 J

(D)

6.17 1020 kJ

HWT/Chemistry

Vidyamandir Classes

DATE :

MARKS : 10

IITJEE :

NAME :

TIME : 25 MINUTES

TEST CODE : G Laws [3]

ROLL NO.

START TIME :

END TIME :

STUDENT’S SIGNATURE :

TIME TAKEN:

PARENT’S SIGNATURE :

This test contains a total of 10 Objective Type Questions. Each question carries 1 mark. There is NO NEGATIVE marking. Choose the correct alternative. Only one choice is correct. 1.

2.

KE per unit volume is : 3 3 RT 3 RN 3 P (A) (B) (C) (D) RT 2 2 n 2 N0 2 Select correct statement(s) : (A) The velocity at which distribution of molecules is maximum is called most probable velocity (B) Most probable velocity of a gas is larger than root mean square velocity (C) Both statements are correct (D) None is correct

3.

Select correct statement(s)

4.

(A)

Kinetic energy is zero at 0C

(C)

Distribution of molecules is very small when u 0 or u

7.

(D) –1

One molecule is moving at a speed of 1ms and two molecules are moving at 2ms . Hence, root mean square velocity is :

1 ms1

(B)

1.67 ms1

(C)

3 ms1

(D)

1.73 ms1

(D)

atm L mol 2

a The ratio of van der Waals constants a and b, has the dimension of : b

(C)

L mol 1

Gas deviates from ideal gas nature because molecules : (A) are colourless (C) contain covalent bond

(B) (D)

attract each other Show Browniam motion

The van der Waals equation is true for : (A) ideal gas (B) real gas

(C)

gaseous substance (D)

(A) 6.

3 8.314 300 1 ms 32 All the statements are correct

RMS velocity of O 2 at 27C is =

–1

(A) 5.

(B)

atm L1

(B)

L atm mol 1

None of these

8.

The van der Waals equation of state reduces itself to the ideal gas equation at : (A) high pressure and low temperature (B) low pressure and low temperature (C) low pressure and high temperature (D) high pressure and high temperature

9.

For CO, isotherm is of the type as shown Near the point A, compressibility factor Z (for 1 mol of CO) is :

10.

(A)

b 1 V

(B)

b 1 V

(C)

a 1 RTV

(D)

a 1 RTV

CO PV

B

Ideal

A

P

In the above Questions, near the point B, compressibility factor Z is about : (A)

VMC/Gas Laws

Pb 1 RT

(B)

1

(C)

24

Pb 1 RT

(D)

a 1 RTV

HWT/Chemistry

Vidyamandir Classes

DATE :

MARKS : 10

IITJEE :

NAME :

TIME : 25 MINUTES

TEST CODE : G Laws [4]

ROLL NO.

START TIME :

END TIME :

STUDENT’S SIGNATURE :

TIME TAKEN:

PARENT’S SIGNATURE :

This test contains a total of 10 Objective Type Questions. Each question carries 1 mark. There is NO NEGATIVE marking. Choose the correct alternative. Only one choice is correct. 1.

Match Column I with Column II and select the correct answers : Column I

2.

Column II

1.

Critical temperature

(p)

a Rb

2.

Boyle temperature

(q)

2a Rb

3.

Inversion temperature

(r)

T Tc

4.

Reduced temperature

(s)

8a 27Rb

(A)

1 2 3 4 q p s r

(B)

1 2 3 4 q r s p

(C)

1 2 3 4 q r s p

(D)

1 2 3 4 s p q r

A gas in an open container is heated from 27C to 127. The fraction of the original amount of the gas remaining in the container will be : (A) 3/4

(B)

1/2

(C)

1/4

(D)

1/8

3.

Mole fraction of water vapour in the water saturated air is 0.02. If total pressure is 1.2 atm, partial pressure of dry air is : (A) 1.18 atm (B) 1.22 atm (C) 1.176 atm (D) 1.224 atm

4.

At constant volume, for a fixed amount of a gas the pressure of the gas increases with rise of temperature due to : (A) increase in average molecular speed (B) increased rate of collision amongst molecules (C) increase in molecular attraction (D) decrease in mean free path

5.

The expression of root mean square speed of molecules of a gas is given as : (A)

6.

(B)

u rms

3RT m

(C)

u rms

3kT M

8RT M

(D)

u rms

u av

8RT m

(B)

u av

8RT M

(C)

u av

8kT M

(D)

u av

8RT M

8RT M

(D)

u mp

8RT M

The expression of most probable speed of molecules of a gas is given as (A)

8.

3RT M

The expression of average speed of molecules of a gas is given as : (A)

7.

u rms

u mp

2RT M

(B)

u mp

3RT M

(C)

u mp

For a given gas, which of the following relationships is correct at a given temperature ? (A)

VMC/Gas Laws

u rms u av u mp

(B)

u rms u av u mp

(C)

25

u rms u av u mp (D)

u rms u av u mp

HWT/Chemistry

Vidyamandir Classes 9.

A molecule of SO2 is two times heavier than O2 molecule. At 298 K, the average kinetic energy of SO2 molecules is (A) two time that of O2 molecules (B) half that of O2 molecules (C) four times that of O2 molecules (D) same as that of O2 molecules

10.

Which of the following is expected to possess the largest root mean square speed at the same temperature? (A) H2S (B) NH3 (C) SO2 (D) CO2

VMC/Gas Laws

26

HWT/Chemistry

Vidyamandir Classes

DATE :

MARKS : 10

IITJEE :

NAME :

TIME : 25 MINUTES

TEST CODE : G Laws [5]

ROLL NO.

START TIME :

END TIME :

STUDENT’S SIGNATURE :

TIME TAKEN:

PARENT’S SIGNATURE :

This test contains a total of 10 Objective Type Questions. Each question carries 1 mark. There is NO NEGATIVE marking. Choose the correct alternative. Only one choice is correct. 1.

The rms speed of hydrogen is

(D)

T(H 2 )

If the volume of 2 moles of an ideal gas at 540 K is 44.8L, its pressure will be : (A) 1 atm (B) 2 atm (C) 3 atm

(D)

4 atm

The compressibility factor of an ideal gas is : (A) 0 (B) 1

(C)

2

(D)

4

The dimensions of pressure are the same as that of (A) energy (C) energy per unit volume

(B) (D)

force force per unit volume

Ice, water and steam can exist simultaneously at (A) All temperatures (C) All temperatures and pressure

(B) (D)

All pressures triple point

(A) 2.

3.

4.

5.

6.

7.

8.

(B)

T(H 2 ) T(N 2 )

The density of a gas will be the highest at : (A) stp (B) 0C and 2atm

(C)

T(H 2 ) T(N 2 )

(C)

(D)

273C and 1 atm (D)

7T (N 2 )

450 K and 2 atm

273C and 2 atm

The density of a gas at 27C and 1 atm is d. At what temperature would its density be 0.75d, if the pressure is kept constant?

20C

(B)

30 C

(C)

pV . The value of R varies with T (B) V (C)

400 K

(D)

300 K

(D)

None of these

For one mole of an ideal gas, R (A)

10

T(H 2 ) T(N 2 )

The behaviour of a gas deviates the least from that of an ideal gas at (A) 550 K and 1 atm (B) 350 K and 3 atm (C) 350 K and 4 atm

(A) 9.

7 times the rms speed to nitrogen. If T is the temperature of the gas, then :

p

T

The temperature above which a gas remains ideal over a wide range of pressures is called (A) boiling point (B) Boyle’s temperature (C) critical temperature (D) ideal temperature

VMC/Gas Laws

27

HWT/Chemistry

Vidyamandir Classes

DATE :

MARKS : 10

IITJEE :

NAME :

TIME : 25 MINUTES

TEST CODE : G Laws [6]

ROLL NO.

START TIME :

END TIME :

STUDENT’S SIGNATURE :

TIME TAKEN:

PARENT’S SIGNATURE :

This test contains a total of 10 Objective Type Questions. Each question carries 1 mark. There is NO NEGATIVE marking. Choose the correct alternative. Only one choice is correct. 1.

The density of methane at 27C and 2.0 atmospheric pressure is : (A)

0.13gL1

(B)

0.26 gL1

(C)

1.30 gL1

(D)

26.0 gL1

2.

A certain gas effuses through a small opening of a vessel at a rate which is exactly one-fifth the rate at which helium does the same. Thus, the molecular weight of the gas is : (A) 100 (B) 75 (C) 50 (D) 25

3.

If the pressure of a gas is reduced to half and the absolute temperature is doubled, the volume of the gas will (A) remain unchanged (B) be reduced to 1/4th (C) be doubled (D) increase fourfold

4.

The weight of CH4 in a 9-L cylinder at 27C temperature and 16 atm pressure is (R = 0.08 L atm K 1mol 1 ) (A) 9.6g (B) 96.0 g (C) 4.8 g (D) 48.0 g

5.

What would be the number of moles of H 2 in 0.224 L of H2(g) at stp (273 K, 1 atm) ? Assume the gas to behave identically : (A) 1.0 (B) 0.1 (C) 0.01 (D) 0.001

6.

At a high pressure, the compressibility factor (Z) of a real gas is usually greater than one. This can be explained from van der Waals equation by neglecting the value of : (A) b (B) a (C) both a and b (D) V

7.

Which of the following statements is correct for pV = nRT ? (A) n is the number of molecules of the gas (B) V denotes the volume of one mole of the gas (C) n moles of the gas has volume V (D) p is the pressure of the gas when only one mole of the gas is present.

8.

The correct value of the universal gas constant, R, is close to :

9.

(A)

0.082 L atm K 1mol 1

(B)

0.082 L atm 1K 1mol 1

(C)

0.082 L atm K mol 1

(D)

0.082 L atm K 1mol 1

The values of the van der Waals constant a for the gases O 2 , N 2 , NH 3 and CH 4 are 1.360L2 atm mol 2 , 1.390L2 atm mol 2 , 4.170L2 atm mol 2 and 2.253 L2 atm mol 2 respectively. The gas which can most easily be liquefied is : (A)

10.

CO2

(B)

N2

(C)

NH3

(D)

CH4

The ratio of the most probable speed, average speed and root-mean-square speed of a gas molecule is : (A) 1 : 1.128 : 1.224 (B) 1 : 1.128 : 1.424 (C) 1 : 2.128 : 1.224 (D) 1 : 1.428 : 1.442

VMC/Gas Laws

28

HWT/Chemistry

Vidyamandir Classes

DATE :

IITJEE :

NAME :

MARKS : 10

TIME : 25 MINUTES

TEST CODE : G Laws [7]

ROLL NO.

START TIME :

STUDENT’S SIGNATURE :

END TIME :

TIME TAKEN:

PARENT’S SIGNATURE :

This test contains a total of 10 Objective Type Questions. Each question carries 1 mark. There is NO NEGATIVE marking. Choose the correct alternative. Only one choice is correct. 1.

A real gas obeying van der Waals equation will resemble an ideal gas if : (A) both a and b are small (B) a is large and b is small (C) a is small and b is large (D) both a and b are large

2.

Equal masses of methane and hydrogen are mixed in an empty container at 25C . The fraction of the total pressure exerted by hydrogen is : (A) 1/12 (B) 8/9 (C) 1/6 (D) 16/17

3.

4.

6.

Which of the following equations represents compressibility factor for 1 mol of gas. pV pV Z Z (A) (B) R T pV RT Z (C) Z (D) RT pV

7.

At high pressure, the van der Waals equation is reduced to : n2a (A) p(V b) nRT p 2 nRT (B) V (C) pV nRT p(V nb) nRT (D)

For a given mass of an ideal gas, pV is plotted against T. The graph shows a : (A) straight line passing through the origin (B) straight line intercepting both axes (C) straight line parallel to the T-axis (D) rectangular hyperbola

8.

At low pressure, the van der Waals equation is reduced to :

The compressibility factor of a gas is less than unity at stp. Therefore, (A) (B) Vm 22.4 L Vm 22.4 L

9.

(C) 5.

Vm 22.4 L

(D)

Vm 44.8 L

Which of the following represents the van der Waal equation for n moles of a real gas ? (A)

a p 2 (V b) nRT V

10.

(A)

n2a p 2 V nR (B) V

pV = nRT

(C)

p(V nb) nRT (D)

n2a p 2 V nRT V

The Boltzmann constant (k B ) is : (A)

RN A

(B)

(C)

R NA

(D)

NA R R T NA

The dimensions of van der Waals constants a and b are respectively, (A)

bar L2 mol 2 and L mol 1

(B)

bar L2 mol 1 and L1mol 1

(B)

a p (V nb) nRT nV 2

(C)

bar L2 mol 2 and L1 mol 1

(C)

n2a p 2 (V nb) nRT V

(D)

bar 1 L2 mol 2 and L2 mol 1

(D)

na p 2 (V nb) nRT V

VMC/Gas Laws

29

the

HWT/Chemistry

Vidyamandir Classes

DATE :

MARKS : 10

IITJEE :

NAME :

TIME : 25 MINUTES

TEST CODE : G Laws [8]

ROLL NO.

START TIME :

END TIME :

STUDENT’S SIGNATURE :

TIME TAKEN:

PARENT’S SIGNATURE :

This test contains a total of 10 Objective Type Questions. Each question carries 1 mark. There is NO NEGATIVE marking. Choose the correct alternative. Only one choice is correct. 1.

According to the ideal gas law, the molar volume of a gas equals RT RT (A) (B) (C) p pV

22.4 L

(D)

RT .W pV

2.

At what temperature do the average speed of CH4 (g) molecules equal the average speed of O2 molecules at 300 K ? (A) 150 K (B) 900 K (C) 600 K (D) 300 K

3.

Which of the following expressions is correct ? (A)

4.

5.

7.

3RT M

rms

3p

(C)

1 pV mnN A 2 rms (D) 3

All of these

N2

All of these

(D)

How many O2 molecules are present in 2.0 L of oxygen gas at 27C temperature and 3.0 atm pressure ?

1.0 103

(B)

1.5 1023

1.5 1024

(C)

Which of the following gases has the highest value of the van der Waals constant a ? (A) (B) (C) CCl 4 ( ) NH 3 (g) CO 2 (g)

(D)

2.5 1024

(D)

H 2 O(g)

Consider the reaction 2Al(s) 3Cl 2 (g) 2AlCl3 (s) . The approximate volume of chlorine that would react with 324 g of aluminium at stp is : (A) 121 L

8.

(B)

0.28 g of a gas occupies 224 mL at stp. The gas could be : (A) CO (B) C2H4 (C)

(A) 6.

rms

(B)

134 L

(C)

260 L

(D)

403 L

In a classroom, there are 13 rows of students. A teacher releases laughing gas ( N 2 O ) from the front and tear gas (molar mass 176) from the rear of the classroom simultaneously. Students of which row from the front will have a tendency to weep and smile simultaneously? (A) 9th row (B) 12th row (C) 7th row (D) 10th row

9.

The vapour density of a mixture containing N 2 (g) and O 2 (g) is 14.4. The percentage of N2 in the mixture is (A)

10

20%

(B)

80%

(C)

60%

The rate of effusion of an ideal gas through a hole depends upon (A) The pressure of the gas (B) (C) area of the hole (D)

VMC/Gas Laws

(D)

50%

The molar mass of the gap All of these

30

HWT/Chemistry

Vidyamandir Classes

DATE :

MARKS : 10

IITJEE :

NAME :

TIME : 25 MINUTES

TEST CODE : G Laws [9]

ROLL NO.

START TIME :

END TIME :

STUDENT’S SIGNATURE :

TIME TAKEN:

PARENT’S SIGNATURE :

This test contains a total of 10 Objective Type Questions. Each question carries 1 mark. There is NO NEGATIVE marking. Choose the correct alternative. Only one choice is correct. 1.

2.

The vapour density of a gas depends upon the : (A) total number of molecules (C) total number of electrons in the molecules

(B) (D)

total number of neutrons in the molecules molecular mass of the gas

Which of the following statements is incorrect ? (A) Gases do not have a definite volume of shape. (B) The volume of an Ideal gas is equal to the volume of the container in which it is kept. (C) A gas exerts pressure on the walls of the container in which it is kept. (D) The mass of a gas cannot be determined by weighing the container in which it is kept.

3.

A sample of a gas at 100C and 0.80 atm pressure has a density of 1.15 g L1 . What is the molecular weight of the gas ? (A) 88.0 (B) 44.0 (C) 28.0 (D) 46.0

4

Which of the following expressions is correct ? (A)

5.

M RT p

(B)

p M RT

If a gas expands at a constant temperature, (A) the pressure decreases (C) the kinetic energy of the molecules decreases

(C)

1 M RT p

(B) (D)

the kinetic energy of the molecules increases the number of molecules of the gas increases

(D)

M (p)RT

6.

A bottle of dry ammonia and a bottle of dry hydrogen chloride connected through a long tube are opened simultaneously at both ends. The white ammonium chloride ring will from first (A) at the centre of the tube (B) near the hydrogen chloride bottle (C) near the ammonia bottle (D) throughout the length of the tube

7.

The root-mean-square speed of O2 gas molecules at 27C is : (A)

498 ms1

(B)

384 ms1

484 ms1

(C)

(D)

584 ms1

8.

A gas is kept at 1 atm pressure. To compress it to 1/4th of its initial volume, the pressure to be applied is : (A) 1 atm (B) 2 atm (C) 4 atm (D) 1/4 atm

9.

A helium atom is two times heavier than a hydrogen molecule. At 298 K, the average KE of a helium atom is : (A) two times that of a hydrogen molecule (B) same as that of a hydrogen molecule (C) four time that of a hydrogen molecule (D) six times that of a hydrogen molecule

10.

The internal energy of one mole of an ideal gas is given by : 1 k BT (A) 3/2 RT (B) (C) 2

VMC/Gas Laws

1 RT 2

31

(D)

3 k BT 2

HWT/Chemistry

Vidyamandir Classes

DATE :

IITJEE :

NAME :

MARKS : 10

TIME : 25 MINUTES

TEST CODE : G Laws [10]

ROLL NO.

START TIME :

STUDENT’S SIGNATURE :

END TIME :

TIME TAKEN:

PARENT’S SIGNATURE :

This test contains a total of 10 Objective Type Questions. Each question carries 1 mark. There is NO NEGATIVE marking. Choose the correct alternative. Only one choice is correct. 1.

The kinetic theory of ideal gas predicts that the total KE of a gaseous assembly depends on the : (A) pressure of the gas (B) temperature of the gas (C) volume of the gas (D) pressure, temperature and volume of the gas

2.

The Boyle temperature for real gases is given by : a a (A) (B) R bR 2a (C) (D) None of these bR

3.

At 27C , the ratio of rms speed of ozone to that of oxygen is :

4.

7.

Food is cooked faster in a pressure cooker because (A) heat is more evently distributed inside the cooker (B) the boiling point of water involved in the cooking is increased (C) the higher pressure inside the cooker crushes the food materials (D) cooking involves chemical changes helped by the rise in temperature

8.

(A)

3/ 5

(B)

4/3

(C)

2/3

(D)

1/16

(B)

KE(CO) KE(N 2 )

(C)

KE(CO) KE (N 2 )

(D)

Cannot be predicted unless the volumes of the gases are given

Which of the following combinations is correct ? (A)

U rms

(B)

U rms T and U rms

(D)

6.

in a straight path with an accelerated velocity

Which of the following expressions correctly represents the relationship between the average molar kinetic energies of CO and N2 molecules at the same temperature ? (A) KE(CO) KE(N 2 )

(C)

5.

(C) (D)

U rms U rms

T and U rms

1 T 1 T

and U rms and U rms

M

1 9.

M 1 M

by :

M

(A)

(p A / p B ) (M A / M B )1 2

(B)

(M A / M B ) (p A / p B )1 2

(C)

(p A / p B ) (M B / M A )1 2

(D)

(M A / M B ) (p B / p A )1 2

In a closed room of 1000 m3, a bottle of perfume is opened. The room is filled with the smell of the perfume. Which property of gases cause this to happen ? (A) Viscosity (B) Density (C) Diffusion (D) None of these

10.

According to the kinetic theory of gases, between two successive collisions, an ideal- gas molecule travels. (A) in a circular path (B) in an elliptical path

VMC/Gas Laws

According to Graham’s law, at a given temperature the ratio of the rate of diffusion of gases A and B (rA / rB ) is given

32

The density of air is 0.001293 g mL1 at stp. Its vapour density will be : (A) 10.0 (B) 15.0 (C) 1.44 (D) 14.4

HWT/Chemistry

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DATE :

MARKS : 10

IITJEE :

NAME :

TIME : 25 MINUTES

TEST CODE : G Laws [1]

ROLL NO.

START TIME :

END TIME :

STUDENT’S SIGNATURE :

TIME TAKEN:

PARENT’S SIGNATURE :

This test contains a total of 10 Objective Type Questions. Each question carries 1 mark. There is NO NEGATIVE marking. Choose the correct alternative. Only one choice is correct. 1.

Which description best fits a ideal gas ? (A) Definite shape and volume ; strong intermolecular attractions (B) Definite volume ; shape of container ; moderate intermolecular attractions (C) Definite volume ; shape of container ; weak intermolecular attractions (D) Volume and shape of container ; no intermolecular attractions

2.

The comparing gases with liquids, gases have … compressibility and … density. (A) greater ; smaller (B) greater ; greater (C) smaller ; smaller

3.

4.

5.

Which represents the largest pressure ? (A) One atmosphere (C) One mm of Hg

smaller ; greater

Five pounds per square inch One hundred Pascal

Which pair of molecules has the strongest dipole – dipole interactions ? (A) (B) (C) NH 3 and CH 4 NH 3 and NH 3 CH 4 and CH 4

(D)

CO 2 and CO 2

What weight of hydrogen at STP could be contained in a vessel that holds 3.36 L O2 gas at STP ? (A)

6.

(B) (D)

(D)

0.21 g

(B)

4.8 g

(C)

0.30 g

(D)

3.36 g

The VD of gas is 11.2. The volume occupied by 11.2g of this gas at NTP is : (A) 22.4 L (B) 11.2 L (C) 1 L

(D)

2.2 L

7.

What will be the new volume when 128 mL of gas at 20.0C is heated to 40C while pressure remains unchanged ? (A) 64.0 mL (B) 120 mL (C) 128 mL (D) 137mL

8.

A sealed container with gas at 2.00 atm is heated from 20.0 K to 40.0 K. The new pressure is : (A) 0.050 atm (B) 1.00 atm (C) 4.00 atm (D)

2.14 atm

The relative rate of diffusion of a gas (molar mass = 128) as compare to oxygen is : (A) 2 times (B) 1/4 (C) 1/8

1/2

9.

10.

(D)

If 4 g of oxygen diffuse through a very narrow hole, how much hydrogen would have diffused under identical conditions ? (A) 16 g (B) 1g (C) 1/4 g (D) 64 g

VMC/Gas Laws

22

HWT/Chemistry

Vidyamandir Classes

DATE :

MARKS : 10

IITJEE :

NAME :

TIME : 25 MINUTES

TEST CODE : G Laws [2]

ROLL NO.

START TIME :

END TIME :

STUDENT’S SIGNATURE :

TIME TAKEN:

PARENT’S SIGNATURE :

This test contains a total of 10 Objective Type Questions. Each question carries 1 mark. There is NO NEGATIVE marking. Choose the correct alternative. Only one choice is correct. 1.

A gas at a pressure of 5.0 atm is heated from 0 to 546C and is simultaneously compressed to one-third of its original volume. Hence final pressure is : 5 atm 9 “The total pressure exerted by a number of non-reacting gases is equal to the sum of partial pressure of the gaseous under the same conditions”. It is known as : (A) Bolye’s law (B) Charles’ law (C) Avogadro’s law (D) Dalton’s law

(A) 2.

15.0 atm

(B)

30.0 atm

(C)

45.0 atm

(D)

3.

For an ideal gas which of the following graphs will not be straight line when all the other variables are held constant ? 1 P vs (A) P vs T (B) V vs T (C) (D) n vs T V

4.

1g H 2 2g He and 3g NO are contained in 1.1 L flask at 300 K. Total pressure exerted by the mixture is : (A)

5.

5.45 atm

(B)

6.0 atm

(C)

24.63 atm

(D)

At the same temperature and pressure which of the following gas will have highest KE per mol ? (A) H2 (B) O2 (C) CH4 (D)

134.34 atm equal

6.

At what temperature will the total KE of 0.30 mol of He be the same as the total KE of 0.40 mol Ar at 400 K ? (A) 533 K (B) 400 K (C) 346 K (D) 300 K

7.

The molecular velocities of two gases at same temperature are u 1 and u2, their molar mass are m1 and m2 respectively. Which of the following expression is correct ? m1 m 2 m1 m 2 (A) (B) (C) 2 (D) m1u12 m 2 u 22 m1u1 m 2 u 2 2 u1 u2 u1 u2

8.

50 mL of H2 gas diffuses through a small hole from a vessel in 20 minutes. Time taken by 40 mL of O2 gas to diffuse under similar conditions will be : (A) 12 min (B) 64 min (C) 8 min (D) 32 min

9.

The average molecular speed is greatest in which of the following gas samples ? (A) 1.0 mol of O2 at 560 K (B) 0.50 mol of Ne at 500 K (C) 0.20 mol of CO2 at 440 K (D) 2.0 mol of He at 140 K

10.

The average kinetic energy of an ideal gas per molecule in SI unit at 25C will be : (A)

VMC/Gas Laws

6.17 1021 kJ

(B)

6.17 1021 J

(C)

23

6.17 1020 J

(D)

6.17 1020 kJ

HWT/Chemistry

Vidyamandir Classes

DATE :

MARKS : 10

IITJEE :

NAME :

TIME : 25 MINUTES

TEST CODE : G Laws [3]

ROLL NO.

START TIME :

END TIME :

STUDENT’S SIGNATURE :

TIME TAKEN:

PARENT’S SIGNATURE :

This test contains a total of 10 Objective Type Questions. Each question carries 1 mark. There is NO NEGATIVE marking. Choose the correct alternative. Only one choice is correct. 1.

2.

KE per unit volume is : 3 3 RT 3 RN 3 P (A) (B) (C) (D) RT 2 2 n 2 N0 2 Select correct statement(s) : (A) The velocity at which distribution of molecules is maximum is called most probable velocity (B) Most probable velocity of a gas is larger than root mean square velocity (C) Both statements are correct (D) None is correct

3.

Select correct statement(s)

4.

(A)

Kinetic energy is zero at 0C

(C)

Distribution of molecules is very small when u 0 or u

7.

(D) –1

One molecule is moving at a speed of 1ms and two molecules are moving at 2ms . Hence, root mean square velocity is :

1 ms1

(B)

1.67 ms1

(C)

3 ms1

(D)

1.73 ms1

(D)

atm L mol 2

a The ratio of van der Waals constants a and b, has the dimension of : b

(C)

L mol 1

Gas deviates from ideal gas nature because molecules : (A) are colourless (C) contain covalent bond

(B) (D)

attract each other Show Browniam motion

The van der Waals equation is true for : (A) ideal gas (B) real gas

(C)

gaseous substance (D)

(A) 6.

3 8.314 300 1 ms 32 All the statements are correct

RMS velocity of O 2 at 27C is =

–1

(A) 5.

(B)

atm L1

(B)

L atm mol 1

None of these

8.

The van der Waals equation of state reduces itself to the ideal gas equation at : (A) high pressure and low temperature (B) low pressure and low temperature (C) low pressure and high temperature (D) high pressure and high temperature

9.

For CO, isotherm is of the type as shown Near the point A, compressibility factor Z (for 1 mol of CO) is :

10.

(A)

b 1 V

(B)

b 1 V

(C)

a 1 RTV

(D)

a 1 RTV

CO PV

B

Ideal

A

P

In the above Questions, near the point B, compressibility factor Z is about : (A)

VMC/Gas Laws

Pb 1 RT

(B)

1

(C)

24

Pb 1 RT

(D)

a 1 RTV

HWT/Chemistry

Vidyamandir Classes

DATE :

MARKS : 10

IITJEE :

NAME :

TIME : 25 MINUTES

TEST CODE : G Laws [4]

ROLL NO.

START TIME :

END TIME :

STUDENT’S SIGNATURE :

TIME TAKEN:

PARENT’S SIGNATURE :

This test contains a total of 10 Objective Type Questions. Each question carries 1 mark. There is NO NEGATIVE marking. Choose the correct alternative. Only one choice is correct. 1.

Match Column I with Column II and select the correct answers : Column I

2.

Column II

1.

Critical temperature

(p)

a Rb

2.

Boyle temperature

(q)

2a Rb

3.

Inversion temperature

(r)

T Tc

4.

Reduced temperature

(s)

8a 27Rb

(A)

1 2 3 4 q p s r

(B)

1 2 3 4 q r s p

(C)

1 2 3 4 q r s p

(D)

1 2 3 4 s p q r

A gas in an open container is heated from 27C to 127. The fraction of the original amount of the gas remaining in the container will be : (A) 3/4

(B)

1/2

(C)

1/4

(D)

1/8

3.

Mole fraction of water vapour in the water saturated air is 0.02. If total pressure is 1.2 atm, partial pressure of dry air is : (A) 1.18 atm (B) 1.22 atm (C) 1.176 atm (D) 1.224 atm

4.

At constant volume, for a fixed amount of a gas the pressure of the gas increases with rise of temperature due to : (A) increase in average molecular speed (B) increased rate of collision amongst molecules (C) increase in molecular attraction (D) decrease in mean free path

5.

The expression of root mean square speed of molecules of a gas is given as : (A)

6.

(B)

u rms

3RT m

(C)

u rms

3kT M

8RT M

(D)

u rms

u av

8RT m

(B)

u av

8RT M

(C)

u av

8kT M

(D)

u av

8RT M

8RT M

(D)

u mp

8RT M

The expression of most probable speed of molecules of a gas is given as (A)

8.

3RT M

The expression of average speed of molecules of a gas is given as : (A)

7.

u rms

u mp

2RT M

(B)

u mp

3RT M

(C)

u mp

For a given gas, which of the following relationships is correct at a given temperature ? (A)

VMC/Gas Laws

u rms u av u mp

(B)

u rms u av u mp

(C)

25

u rms u av u mp (D)

u rms u av u mp

HWT/Chemistry

Vidyamandir Classes 9.

A molecule of SO2 is two times heavier than O2 molecule. At 298 K, the average kinetic energy of SO2 molecules is (A) two time that of O2 molecules (B) half that of O2 molecules (C) four times that of O2 molecules (D) same as that of O2 molecules

10.

Which of the following is expected to possess the largest root mean square speed at the same temperature? (A) H2S (B) NH3 (C) SO2 (D) CO2

VMC/Gas Laws

26

HWT/Chemistry

Vidyamandir Classes

DATE :

MARKS : 10

IITJEE :

NAME :

TIME : 25 MINUTES

TEST CODE : G Laws [5]

ROLL NO.

START TIME :

END TIME :

STUDENT’S SIGNATURE :

TIME TAKEN:

PARENT’S SIGNATURE :

This test contains a total of 10 Objective Type Questions. Each question carries 1 mark. There is NO NEGATIVE marking. Choose the correct alternative. Only one choice is correct. 1.

The rms speed of hydrogen is

(D)

T(H 2 )

If the volume of 2 moles of an ideal gas at 540 K is 44.8L, its pressure will be : (A) 1 atm (B) 2 atm (C) 3 atm

(D)

4 atm

The compressibility factor of an ideal gas is : (A) 0 (B) 1

(C)

2

(D)

4

The dimensions of pressure are the same as that of (A) energy (C) energy per unit volume

(B) (D)

force force per unit volume

Ice, water and steam can exist simultaneously at (A) All temperatures (C) All temperatures and pressure

(B) (D)

All pressures triple point

(A) 2.

3.

4.

5.

6.

7.

8.

(B)

T(H 2 ) T(N 2 )

The density of a gas will be the highest at : (A) stp (B) 0C and 2atm

(C)

T(H 2 ) T(N 2 )

(C)

(D)

273C and 1 atm (D)

7T (N 2 )

450 K and 2 atm

273C and 2 atm

The density of a gas at 27C and 1 atm is d. At what temperature would its density be 0.75d, if the pressure is kept constant?

20C

(B)

30 C

(C)

pV . The value of R varies with T (B) V (C)

400 K

(D)

300 K

(D)

None of these

For one mole of an ideal gas, R (A)

10

T(H 2 ) T(N 2 )

The behaviour of a gas deviates the least from that of an ideal gas at (A) 550 K and 1 atm (B) 350 K and 3 atm (C) 350 K and 4 atm

(A) 9.

7 times the rms speed to nitrogen. If T is the temperature of the gas, then :

p

T

The temperature above which a gas remains ideal over a wide range of pressures is called (A) boiling point (B) Boyle’s temperature (C) critical temperature (D) ideal temperature

VMC/Gas Laws

27

HWT/Chemistry

Vidyamandir Classes

DATE :

MARKS : 10

IITJEE :

NAME :

TIME : 25 MINUTES

TEST CODE : G Laws [6]

ROLL NO.

START TIME :

END TIME :

STUDENT’S SIGNATURE :

TIME TAKEN:

PARENT’S SIGNATURE :

This test contains a total of 10 Objective Type Questions. Each question carries 1 mark. There is NO NEGATIVE marking. Choose the correct alternative. Only one choice is correct. 1.

The density of methane at 27C and 2.0 atmospheric pressure is : (A)

0.13gL1

(B)

0.26 gL1

(C)

1.30 gL1

(D)

26.0 gL1

2.

A certain gas effuses through a small opening of a vessel at a rate which is exactly one-fifth the rate at which helium does the same. Thus, the molecular weight of the gas is : (A) 100 (B) 75 (C) 50 (D) 25

3.

If the pressure of a gas is reduced to half and the absolute temperature is doubled, the volume of the gas will (A) remain unchanged (B) be reduced to 1/4th (C) be doubled (D) increase fourfold

4.

The weight of CH4 in a 9-L cylinder at 27C temperature and 16 atm pressure is (R = 0.08 L atm K 1mol 1 ) (A) 9.6g (B) 96.0 g (C) 4.8 g (D) 48.0 g

5.

What would be the number of moles of H 2 in 0.224 L of H2(g) at stp (273 K, 1 atm) ? Assume the gas to behave identically : (A) 1.0 (B) 0.1 (C) 0.01 (D) 0.001

6.

At a high pressure, the compressibility factor (Z) of a real gas is usually greater than one. This can be explained from van der Waals equation by neglecting the value of : (A) b (B) a (C) both a and b (D) V

7.

Which of the following statements is correct for pV = nRT ? (A) n is the number of molecules of the gas (B) V denotes the volume of one mole of the gas (C) n moles of the gas has volume V (D) p is the pressure of the gas when only one mole of the gas is present.

8.

The correct value of the universal gas constant, R, is close to :

9.

(A)

0.082 L atm K 1mol 1

(B)

0.082 L atm 1K 1mol 1

(C)

0.082 L atm K mol 1

(D)

0.082 L atm K 1mol 1

The values of the van der Waals constant a for the gases O 2 , N 2 , NH 3 and CH 4 are 1.360L2 atm mol 2 , 1.390L2 atm mol 2 , 4.170L2 atm mol 2 and 2.253 L2 atm mol 2 respectively. The gas which can most easily be liquefied is : (A)

10.

CO2

(B)

N2

(C)

NH3

(D)

CH4

The ratio of the most probable speed, average speed and root-mean-square speed of a gas molecule is : (A) 1 : 1.128 : 1.224 (B) 1 : 1.128 : 1.424 (C) 1 : 2.128 : 1.224 (D) 1 : 1.428 : 1.442

VMC/Gas Laws

28

HWT/Chemistry

Vidyamandir Classes

DATE :

IITJEE :

NAME :

MARKS : 10

TIME : 25 MINUTES

TEST CODE : G Laws [7]

ROLL NO.

START TIME :

STUDENT’S SIGNATURE :

END TIME :

TIME TAKEN:

PARENT’S SIGNATURE :

This test contains a total of 10 Objective Type Questions. Each question carries 1 mark. There is NO NEGATIVE marking. Choose the correct alternative. Only one choice is correct. 1.

A real gas obeying van der Waals equation will resemble an ideal gas if : (A) both a and b are small (B) a is large and b is small (C) a is small and b is large (D) both a and b are large

2.

Equal masses of methane and hydrogen are mixed in an empty container at 25C . The fraction of the total pressure exerted by hydrogen is : (A) 1/12 (B) 8/9 (C) 1/6 (D) 16/17

3.

4.

6.

Which of the following equations represents compressibility factor for 1 mol of gas. pV pV Z Z (A) (B) R T pV RT Z (C) Z (D) RT pV

7.

At high pressure, the van der Waals equation is reduced to : n2a (A) p(V b) nRT p 2 nRT (B) V (C) pV nRT p(V nb) nRT (D)

For a given mass of an ideal gas, pV is plotted against T. The graph shows a : (A) straight line passing through the origin (B) straight line intercepting both axes (C) straight line parallel to the T-axis (D) rectangular hyperbola

8.

At low pressure, the van der Waals equation is reduced to :

The compressibility factor of a gas is less than unity at stp. Therefore, (A) (B) Vm 22.4 L Vm 22.4 L

9.

(C) 5.

Vm 22.4 L

(D)

Vm 44.8 L

Which of the following represents the van der Waal equation for n moles of a real gas ? (A)

a p 2 (V b) nRT V

10.

(A)

n2a p 2 V nR (B) V

pV = nRT

(C)

p(V nb) nRT (D)

n2a p 2 V nRT V

The Boltzmann constant (k B ) is : (A)

RN A

(B)

(C)

R NA

(D)

NA R R T NA

The dimensions of van der Waals constants a and b are respectively, (A)

bar L2 mol 2 and L mol 1

(B)

bar L2 mol 1 and L1mol 1

(B)

a p (V nb) nRT nV 2

(C)

bar L2 mol 2 and L1 mol 1

(C)

n2a p 2 (V nb) nRT V

(D)

bar 1 L2 mol 2 and L2 mol 1

(D)

na p 2 (V nb) nRT V

VMC/Gas Laws

29

the

HWT/Chemistry

Vidyamandir Classes

DATE :

MARKS : 10

IITJEE :

NAME :

TIME : 25 MINUTES

TEST CODE : G Laws [8]

ROLL NO.

START TIME :

END TIME :

STUDENT’S SIGNATURE :

TIME TAKEN:

PARENT’S SIGNATURE :

This test contains a total of 10 Objective Type Questions. Each question carries 1 mark. There is NO NEGATIVE marking. Choose the correct alternative. Only one choice is correct. 1.

According to the ideal gas law, the molar volume of a gas equals RT RT (A) (B) (C) p pV

22.4 L

(D)

RT .W pV

2.

At what temperature do the average speed of CH4 (g) molecules equal the average speed of O2 molecules at 300 K ? (A) 150 K (B) 900 K (C) 600 K (D) 300 K

3.

Which of the following expressions is correct ? (A)

4.

5.

7.

3RT M

rms

3p

(C)

1 pV mnN A 2 rms (D) 3

All of these

N2

All of these

(D)

How many O2 molecules are present in 2.0 L of oxygen gas at 27C temperature and 3.0 atm pressure ?

1.0 103

(B)

1.5 1023

1.5 1024

(C)

Which of the following gases has the highest value of the van der Waals constant a ? (A) (B) (C) CCl 4 ( ) NH 3 (g) CO 2 (g)

(D)

2.5 1024

(D)

H 2 O(g)

Consider the reaction 2Al(s) 3Cl 2 (g) 2AlCl3 (s) . The approximate volume of chlorine that would react with 324 g of aluminium at stp is : (A) 121 L

8.

(B)

0.28 g of a gas occupies 224 mL at stp. The gas could be : (A) CO (B) C2H4 (C)

(A) 6.

rms

(B)

134 L

(C)

260 L

(D)

403 L

In a classroom, there are 13 rows of students. A teacher releases laughing gas ( N 2 O ) from the front and tear gas (molar mass 176) from the rear of the classroom simultaneously. Students of which row from the front will have a tendency to weep and smile simultaneously? (A) 9th row (B) 12th row (C) 7th row (D) 10th row

9.

The vapour density of a mixture containing N 2 (g) and O 2 (g) is 14.4. The percentage of N2 in the mixture is (A)

10

20%

(B)

80%

(C)

60%

The rate of effusion of an ideal gas through a hole depends upon (A) The pressure of the gas (B) (C) area of the hole (D)

VMC/Gas Laws

(D)

50%

The molar mass of the gap All of these

30

HWT/Chemistry

Vidyamandir Classes

DATE :

MARKS : 10

IITJEE :

NAME :

TIME : 25 MINUTES

TEST CODE : G Laws [9]

ROLL NO.

START TIME :

END TIME :

STUDENT’S SIGNATURE :

TIME TAKEN:

PARENT’S SIGNATURE :

This test contains a total of 10 Objective Type Questions. Each question carries 1 mark. There is NO NEGATIVE marking. Choose the correct alternative. Only one choice is correct. 1.

2.

The vapour density of a gas depends upon the : (A) total number of molecules (C) total number of electrons in the molecules

(B) (D)

total number of neutrons in the molecules molecular mass of the gas

Which of the following statements is incorrect ? (A) Gases do not have a definite volume of shape. (B) The volume of an Ideal gas is equal to the volume of the container in which it is kept. (C) A gas exerts pressure on the walls of the container in which it is kept. (D) The mass of a gas cannot be determined by weighing the container in which it is kept.

3.

A sample of a gas at 100C and 0.80 atm pressure has a density of 1.15 g L1 . What is the molecular weight of the gas ? (A) 88.0 (B) 44.0 (C) 28.0 (D) 46.0

4

Which of the following expressions is correct ? (A)

5.

M RT p

(B)

p M RT

If a gas expands at a constant temperature, (A) the pressure decreases (C) the kinetic energy of the molecules decreases

(C)

1 M RT p

(B) (D)

the kinetic energy of the molecules increases the number of molecules of the gas increases

(D)

M (p)RT

6.

A bottle of dry ammonia and a bottle of dry hydrogen chloride connected through a long tube are opened simultaneously at both ends. The white ammonium chloride ring will from first (A) at the centre of the tube (B) near the hydrogen chloride bottle (C) near the ammonia bottle (D) throughout the length of the tube

7.

The root-mean-square speed of O2 gas molecules at 27C is : (A)

498 ms1

(B)

384 ms1

484 ms1

(C)

(D)

584 ms1

8.

A gas is kept at 1 atm pressure. To compress it to 1/4th of its initial volume, the pressure to be applied is : (A) 1 atm (B) 2 atm (C) 4 atm (D) 1/4 atm

9.

A helium atom is two times heavier than a hydrogen molecule. At 298 K, the average KE of a helium atom is : (A) two times that of a hydrogen molecule (B) same as that of a hydrogen molecule (C) four time that of a hydrogen molecule (D) six times that of a hydrogen molecule

10.

The internal energy of one mole of an ideal gas is given by : 1 k BT (A) 3/2 RT (B) (C) 2

VMC/Gas Laws

1 RT 2

31

(D)

3 k BT 2

HWT/Chemistry

Vidyamandir Classes

DATE :

IITJEE :

NAME :

MARKS : 10

TIME : 25 MINUTES

TEST CODE : G Laws [10]

ROLL NO.

START TIME :

STUDENT’S SIGNATURE :

END TIME :

TIME TAKEN:

PARENT’S SIGNATURE :

This test contains a total of 10 Objective Type Questions. Each question carries 1 mark. There is NO NEGATIVE marking. Choose the correct alternative. Only one choice is correct. 1.

The kinetic theory of ideal gas predicts that the total KE of a gaseous assembly depends on the : (A) pressure of the gas (B) temperature of the gas (C) volume of the gas (D) pressure, temperature and volume of the gas

2.

The Boyle temperature for real gases is given by : a a (A) (B) R bR 2a (C) (D) None of these bR

3.

At 27C , the ratio of rms speed of ozone to that of oxygen is :

4.

7.

Food is cooked faster in a pressure cooker because (A) heat is more evently distributed inside the cooker (B) the boiling point of water involved in the cooking is increased (C) the higher pressure inside the cooker crushes the food materials (D) cooking involves chemical changes helped by the rise in temperature

8.

(A)

3/ 5

(B)

4/3

(C)

2/3

(D)

1/16

(B)

KE(CO) KE(N 2 )

(C)

KE(CO) KE (N 2 )

(D)

Cannot be predicted unless the volumes of the gases are given

Which of the following combinations is correct ? (A)

U rms

(B)

U rms T and U rms

(D)

6.

in a straight path with an accelerated velocity

Which of the following expressions correctly represents the relationship between the average molar kinetic energies of CO and N2 molecules at the same temperature ? (A) KE(CO) KE(N 2 )

(C)

5.

(C) (D)

U rms U rms

T and U rms

1 T 1 T

and U rms and U rms

M

1 9.

M 1 M

by :

M

(A)

(p A / p B ) (M A / M B )1 2

(B)

(M A / M B ) (p A / p B )1 2

(C)

(p A / p B ) (M B / M A )1 2

(D)

(M A / M B ) (p B / p A )1 2

In a closed room of 1000 m3, a bottle of perfume is opened. The room is filled with the smell of the perfume. Which property of gases cause this to happen ? (A) Viscosity (B) Density (C) Diffusion (D) None of these

10.

According to the kinetic theory of gases, between two successive collisions, an ideal- gas molecule travels. (A) in a circular path (B) in an elliptical path

VMC/Gas Laws

According to Graham’s law, at a given temperature the ratio of the rate of diffusion of gases A and B (rA / rB ) is given

32

The density of air is 0.001293 g mL1 at stp. Its vapour density will be : (A) 10.0 (B) 15.0 (C) 1.44 (D) 14.4

HWT/Chemistry

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