Jee 2014 Booklet5 Hwt Thermodynamics
Short Description
Jee 2014 Booklet5 Hwt Thermodynamics...
Description
Vidyamandir Classes DATE :
TIME : 30 Minutes
MARKS : [ ___ /10]
TEST CODE : THERMO [1]
START TIME :
END TIME :
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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.
3.
4.
An ideal gas expands in volume from 1 103 m3 to 1 102 m3 at 300 K against a constant pressure of 1 105 Nm 2 . The work done is: (A) (B) (C) (D) 900 kJ 900 J 900 kJ 270 kJ Which one of the following is an exothermic reaction? (A)
N 2 (g) O2 (g) 180.8 kJ 2NO(g)
(C)
C(g) H 2 O(g) CO(g) H 2 (g) 131.1 kJ (D)
(B)
N 2 (g) 3H 2 (g) 90 kJ 2NH 3 (g) C(graphite) 2S(s) CS2 (l ) 91.9 kJ
Which of the following taking place in the blast furnace is endothermic? (A)
CaCO3 CaO CO2
(B)
2C O2 2CO
(C)
C O2 CO2
(D)
Fe2 O3 3CO 2Fe 3CO2
(C)
Work
Which one of the following is not a state function? (A) Enthalpy (B) Entropy
(D)
Free energy
5.
The work done during the expansion of a gas from a volume of 4 dm3 to 6 dm3 against a constant external pressure of 3 atm is : (A) (B) (C) (D) 6 J 608 J 304 J 304 J
6.
Which is an extensive property? (A) Temperature (B)
Chemical potential (C)
Gibb’s free energy (D)
Molar volume
In an adiabatic process : (A) p . V 0
q=+W
(C)
E q
(D)
q=0
(C)
Work
(D)
Entropy
II.
2HgO(s) 2Hg(l ) O 2 (g) 181.6 kJ
(B) (D)
Both of them are endothermic I is endothermic and II is exothermic
7.
8.
9.
(B)
Which of the following is a path function? (A) Internal energy (B) Enthalpy For the following two reactions, I.
CH 4 (g) 2O 2 (g) CO 2 (g) 2H 2O H 890.4 kJ
Which one of the following statements is correct? (A) Both of them are exothermic (C) I is exothermic and II is endothermic 10.
A process is taking place at constant temperature and pressure. Then : (A)
H E
VMC/Thermodynamics
(B)
H T S
(C)
1
H 0
(D)
S 0
HWT/Chemistry
Vidyamandir Classes DATE :
TIME : 30 Minutes
MARKS : [ ___ /10]
TEST CODE : THERMO [2]
START TIME :
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.
2.
3.
Which is correct for an endothermic reaction? (A) (B) H is positive H is negative In an isothermal process : (A) q 0 and E 0 (B)
q 0 and E 0 (C)
E is negative
(D)
q 0 and E 0 (D)
H 0
q 0 and E 0
When one mole of monoatomic ideal gas at TK undergoes adiabatic change under a constant external pressure of 1 atm change volume from 1 L to 2L. The final temperature in Kelvin would be :
T
(A)
2 4.
(C)
2/3
(B)
T
2 3 0.0821
(C)
T
(D)
T
2 3 0.0821
Which of the following is an endothermic reaction? (A)
N 2 (g) 3H 2 (g) 92 kJ 2NH 3 (g)
(B)
N 2 (g) O 2 (g) 180.8kJ 2NO(g)
(C)
H 2 (g) Cl 2 (g) 2HCl(g) 184.6 kJ
(D)
C(graphite) 2H 2 (g) CH 4 (g) 74.8 kJ
5.
To calculate the amount of work done in joules during reversible isothermal expansion of an ideal gas, the volume must be expressed in : (A) m3 only (B) dm3 only (C) cm3 only (D) Any of these
6.
A gas can expand from 100 mL to 250 mL under a constant pressure of 2 atm. The work done by gas is : (A) 30.38 J (B) 25 J (C) 5 kJ (D) 16 J
7.
What is E for system that does 500 cal of work on surrounding and 300 cal of heat is absorbed by the system? (A) (B) (C) (D) 200 cal 300 cal 200 cal 300 cal
8.
C(s) O2 (g) CO2 (g); H 94 kcal 2CO(g) O2 2CO2 (g); H 135.2 kcal The heat of formation of CO (g) is : (A) (B) 26.4 kcal
9.
10.
41.2 kcal
Internal energy is sum of : (A) Kinetic energy of potential energy (C) Energy of internal system If C(s) O2 (g) CO 2 (g); H r and CO(g) (A)
r+s
VMC/Thermodynamics
(B)
rs
(C)
26.4 kcal
(D)
229.2 kcal
(B) (D)
All type of energy of the system None of the above
1 O2 CO2 (g); H s then the heat of formation of CO is: 2 (C) (D) rs sr
2
HWT/Chemistry
Vidyamandir Classes DATE :
TIME : 30 Minutes
MARKS : [ ___ /10]
TEST CODE : THERMO [3]
START TIME :
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 gas expands isothermally against a constant external pressure of 1 atm from a volume of 10 dm3 to a volume of 20 dm3. It absorbs 800 J of thermal energy from its surroundings. The U is : (A) –312 J (B) + 123 J (C) –213 J (D) + 231 J
2.
Hess’s law is based on : (A) Law of conservation of mass (B) Law of conservation of energy (C) First law of thermodynamics (D) None of the above
3.
A hypothetical reaction A 2B , proceeds through following sequence of steps I. A C; H q II.
7.
Hess’s law states that : (A) The standard enthalpy of an overall reaction is the sum of the enthalpy changes in individual reactions. (B) Enthalpy of formation of a compound is same an the enthalpy of decomposition of the compound into constituent elements, but with opposite sign. (C) At constant temperature the pressure of a gas is inversely proportional to its volume. (D) The mass of a gas dissolved per litre of a solvent is proportional to the pressure of the gas in equilibrium with the solution.
8.
If gas, at constant temperature and pressure expands then it. (A) Entropy increases and then decreases (B) Internal energy increases
C D; H v
1 D B; H x 2 Then the heat of reaction is : (A) (B) q v 2x
q v 2x
(C)
q 2v 2x
III.
4.
9.
q E W
(D)
72.8 kJ/mol
(D)
Internal energy remains the same Internal energy decreases
The value of enthalpy change ( H) for the reaction
C2 H5 OH(l ) 3O 2 (g) 2CO 2 (g) 3H 2 O(l ),
at 27 C is 1366.5kJ mol1 . The value of internal
W q E
energy change for the above reaction at this temperature will be : (A) (B) 1371.5 kJ 1369.0 kJ
The sublimation energy of I2 (s) is 57.3 kJ/mol and the enthalpy of fusion is 15.5 kJ/mol. The enthalpy of vaporization of I2 is : (A) 41.8 kJ/mol (B) 41.8 kJ / mol (C)
6.
(D)
The first law of thermodynamics is expressed as : (A) (B) q W E E q W (C)
5.
q + v + 2x
(C) (D)
(C) 10.
72.8 kJ / mol
1364.0 kJ
(D)
1361.5 kJ
Consider the reaction,
The value of E for combustion of 16 g of CH4 is 885389 J at 298 K. The H combustion for CH4 in
4NO 2 (g) O 2 (g) 2N 2 O5 (g), r H 111kJ . If N2O5(s) is formed instead of N2O5 (g) in the above reaction, the r H value will be :
J mol 1 at this temperature will be :
(Given, H of sublimation for N 2 O5 is 54 kJ mol 1 )
(Given that, R 8.314 JK 1 mol 1 ) (A)
55337
(B)
880430
(C)
885389
(D)
890348
VMC/Thermodynamics
3
(A)
165 kJ
(B)
+ 54 kJ
(C)
+ 219 kJ
(D)
219 kJ
HWT/Chemistry
Vidyamandir Classes DATE :
TIME : 30 Minutes
MARKS : [ ___ /10]
TEST CODE : THERMO [4]
START TIME :
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 amount of the heat released when 20 mL 0.5 M NaOH is mixed with 100 mL 0.1 M HCl is x kJ. ? The heat of neutralization is: (A) (B) (C) + 100x kJ/mol (D) + 50x kJ/mol 100 x kJ / mol 50 x kJ / mol
2.
The species which by definition has zero standard molar enthalpy of formation at 298 K is : (A) Br2 (g) (B) Cl2 (g) (C) H2O (g) (D)
3.
CH4 (g)
The standard enthalpy of formation of NH3 is 46.0kJ mol 1 . If the enthalpy of formation of H2 from its atoms is 436 kJ mol 1 and that of N2 is 712kJ mol 1 , the average bond enthalpy of N H bond in NH3 is : (A)
4.
964 kJ mol 1
(B)
352 kJ mol 1
(C)
1056 kJ mol 1
(D)
1102 kJ mol 1
In which of the following reactions, the enthalpy is the least? (A)
CH 3COOH NaOH CH 3COONa H 2 O (B)
HCl NH 4 OH NH 4 Cl H 2 O
(C)
HCl NaOH NaCl H 2 O
HCN NH 4OH NH 4CN H 2O
(D)
5.
For the reaction A B; H 24 kJ / mol and B C; H 18 kJ / mol , the decreasing order of enthalpy of A, B, C follows the order: (A) A, B, C (B) B, C, A (C) C, B, A (D) C, A, B
6.
C2 H 2
5 O2 2CO2 H 2 O ; H 310 kcal 2
C O 2 CO 2 ; H 94 kcal 1 H 2 O 2 H 2 O; H 68 kcal 2 On the basis of the above equations, H f (enthalpy of formation) of C2H2 will be : (A)
148 kcal
(B)
+ 54 kcal
(C)
54 kcal
(D)
+ 80 kcal
7.
The enthalpy of formation of NH3 is 46 kJ mol 1 . The enthalpy change for the reaction 2NH 3 (g) N 2 (g) 3H 2 (g) is : (A) + 184 kJ (B) + 23 kJ (C) + 92 kJ (D) + 46 kJ
8.
Calculate H in kJ for the following reaction C(g) O2 (g) CO2 (g) Given that,
(A)
393
VMC/Thermodynamics
H 2 O(g) C(g) CO(g) H 2 (g);
H 131kJ
1 CO(g) O 2 (g) CO 2 (g); 2 1 H 2 (g) O 2 (g) H 2 O(g); 2 (B) + 393
H 282 kJ H 242 kJ
(C)
4
+ 655
(D)
655
HWT/Chemistry
Vidyamandir Classes 9.
The heat of formations for CO2 (g), H2O (l) and CH4 (g) are 400 kJ mol 1 , 280 kJ mol 1 and 70 kJ mol 1 respectively. The heat of combustion of CH4 in kJ mol 1 is : (A)
10.
890
(B)
160
(C)
890
(D)
90
(D)
y 2x
Using the following thermochemical equations I.
S(rhombic)
II.
SO 2 (g)
3 O 2 (g) SO3 (g) ; H 2x kJ mol 1 2
1 O 2 (g) SO3 (g) ; 2
H y kJ mol 1
Find out the heat of formation of SO2 (g) in kJ mol 1 . (A)
(2x + y)
VMC/Thermodynamics
(B)
(x + y)
(C)
5
2x y
HWT/Chemistry
Vidyamandir Classes DATE :
TIME : 30 Minutes
MARKS : [ ___ /10]
TEST CODE : THERMO [5]
START TIME :
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.
Which of the following reaction defines H f ? (A)
C(diamond) O2 (g) CO2 (g)
(B)
1 1 H 2 (g) F2 (g) HF(g) 2 2
(C)
N 2 (g) 3H 2 (g) 2NH 3 (g)
(D)
CO(g)
1 O 2 (g) CO 2 (g) 2
2.
Consider the reaction, N 2 3H 2 2NH3 carried out at constant temperature and pressure. If H and U are the enthalpy and internal energy changes for the reaction, which of the following expressions is true? (A) (B) (C) (D) H U H U H U H 0
3.
The relation between H and U is : (A)
4.
5. 6.
H U RT
(B)
H U nRT (C)
The bond energy is the energy required to : (A) Dissociate one mole of the substance (C) Break one mole of similar bonds
(B) (D)
H U nRT (D)
U H nRT
Dissociate bond in 1 kg of the substance Break bonds in one mole of substance
For an ideal gas, the heat of reaction at constant pressure and constant volume are related as : (A) (B) (C) q p q v nRT (D) H E pV E H pV
None of these
A monoatomic ideal gas undergoes a process in which the ratio of p to v at any instant is constant and equals to 1. What is the molar heat capacity of the gas? (A)
4R 2
(B)
3R 2
(C)
5R 2
(D)
0
7.
For the reaction, A (g) 2B(g) 2C(g) 3D (g) the change of enthalpy at 27 C is 19 kcal. The value of E is :
8.
(A) 21.2 kcal (B) 17.8 kcal In an isochoric process, H for a system is equal to (A) (B) pV p . V
9.
The enthalpy of reaction, H 2 (g) Then : (A)
10.
H1 H 2
(B)
(C)
18.4 kcal
(D)
20.6 kcal
(C)
E p . V
(D)
E
1 1 O2 (g) H 2 O (g) is H1 and that of H 2 (g) O2 (g) H 2 O ( l ) is H 2 . 2 2 H1 H 2 0
(C)
H1 H 2
(D)
H1 H 2
Identify the reaction for which H E (A)
S(rhombic) O2 (g) SO2 (g)
(B)
N 2 (g) O 2 (g) 2NO (g)
(C)
H 2 (g) Cl 2 (g) 2HCl (g)
(D)
CO (g)
VMC/Thermodynamics
6
1 O2 (g) CO2 (g) 2
HWT/Chemistry
Vidyamandir Classes DATE :
TIME : 30 Minutes
MARKS : [ ___ /10]
TEST CODE : THERMO [6]
START TIME :
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.
2.
Which of the following indicates the heat of reaction equal to heat of formation? (A)
C(graphite) O2 (1 atm) CO2 (1 atm)
(B)
C(diamond) O2 (1 atm) CO2 (2 atm)
(C)
C(graphite) O2 (1 atm) CO2 (2 atm)
(D)
C(diamond) O2 (1 atm) CO2 (1 atm)
The H – H bond energy is 430 kJ mol 1 and Cl Cl bond energy is 240 kJ mol 1 , H for HCl is 90 kJ . The H – Cl bond energy is about : (A)
3.
180 kJ mol 1
360 kJ mol 1
(B)
(C)
213 kJ mol 1
425 kJ mol 1
(D)
The amount of energy released when 20 mL of 0.5 M NaOH are mixed with 100 mL of 0.1 M HCl is x kJ. The heat of neutralization is (in kJ mol 1 ) . (A)
4.
50 x
(B)
(C)
+ 100 x
(D)
+ 50 x
The heat of neutralization of HCl by NaOH is 55.9 kJ / mol , the energy of dissociation of HCN is : (A)
5.
100 x
43.8 kJ
43.8 kJ
(B)
(C)
68 kJ
(D)
68 kJ
If the bond dissociation energies of XY, X2 and Y2 (all diatomic molecules) are in the ratio of 1 : 1 : 0.5 and H f for the formation of XY is 200 kJ mol 1 . The bond dissociation energy of X2 will be : (A)
6.
7.
8.
400 kJ mol 1
300 kJ mol 1
(B)
(C)
20 kJ mol 1
For the gaseous reaction involving the complete combustion of iso-butane : (A) (B) (C) H E H E H E The cooling in refrigerator is due to : (A) Reaction of the refrigerator gas (C) The expansion of the gas in the refrigerator
(B) (D)
(D)
None of these
(D)
None of these
Expansion of ice The work of the compressor
What would be the heat released when an aqueous solution containing 0.5 mole of HNO3 is mixed with 0.3 mole of OH (enthalpy of neutralization is 57.1 kJ ) ?
9.
(A)
28.5 kJ
45.7 kJ
(D)
1.7 kJ
If
S O2 SO2 ; H 298.2 kJ
650.3 kJ
(D)
933.7 kJ
The heat of neutralization of any strong acid and a strong base is nearly equal to : (A) (B) + 57.3 kJ (C) 75.3kJ 57.3 kJ
(D)
+ 75.3 kJ
SO2
(B)
1 O2 SO3 ; 2
17.1 kJ
(C)
H 130.2 kJ
1 H 2 O2 H 2 O ; H 287.3 kJ 2 Then the enthalpy of formation of H2SO4 at 298 K will be : (A) (B) + 320.5 kJ (C) 814.4 kJ
VMC/Thermodynamics
2.85 kJ
H 98.7 kJ
SO3 H 2 O H 2SO4 ;
10.
(E)
7
HWT/Chemistry
Vidyamandir Classes DATE :
TIME : 30 Minutes
MARKS : [ ___ /10]
TEST CODE : THERMO [7]
START TIME :
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.
2.
Heat required to raise the temperature of 1 mole of a substance by 1 is called : (A) Specific heat (B) Molar heat capacity (C) Water equivalent
Specific gravity
Enthalpy of formation of HF and HCl are 161 kJ and 92 kJ respectively. Which of the following statements is incorrect? (A) (B) (C) (D)
3.
(D)
HCl is more stable than HF HF and HCl are exothermic compounds The affinity of fluorine to hydrogen is greater than the affinity of chlorine to hydrogen HF is more stable than HCl
The enthalpies of formation of Al2O3 and Cr2O3 are
1596 kJ and 1134 kJ respectively.
H
for the reaction,
2Al Cr2 O3 2Cr Al 2 O3 is : (A) 4.
5.
6.
462 kJ
(C)
1365 kJ
(D)
+ 2730 kJ
Which of the following equations correctly represents the standard heat of formation ( H f ) of methane? (A)
C(diamond) 4H (g) CH 4 (g)
(B)
C(diamond) 2H 2 (g) CH 4 (g)
(C)
C(graphite) 2H 2 (g) CH 4 (g)
(D)
C(graphite) 4H (g) CH 4 (g)
Average C – H bond energy is 416 kJ mol 1 . Which of the following is correct? (A)
CH 4 (g) 416 kJ C(g) 4H (g)
(B)
CH 4 (g) C(g) 4H (g) 416 kJ
(C)
CH 4 (g) 1664 kJ C(g) 4H (g)
(D)
CH 4 (g) C(g) 4H (g) 1664 kJ
For he reaction, A (s) 3B(g) 4C(g) D ( l ) H and U are related as : H U
(B)
H U 3RT (C)
H U RT
(D)
H U 3RT
(C)
H 0
(D)
H E
(C)
H E
(D)
None of these
For the gaseous reaction, N 2 O4 2NO2 (A)
8.
(B)
(A) 7.
2730 kJ
H E
(B)
H E
For the reaction, PCl5 (g) PCl3 (g) Cl 2 (g) (A)
H E
(B)
H E
9.
The enthalpy change ( H) for the process N 2 H 4 (g) 2N(g) 4H (g) is 1724 kJ mol 1 . If the bond energy of N – H bond
in
ammonia is 391 kJ mol 1 , what is the bond energy for N – N bond in N2H4? (A)
10.
391 kJ mol 1
(B)
160 kJ mol 1
(C)
1173 kJ mol 1
(D)
320 kJ mol 1
Which of the reaction defines H f ? (A)
C(diamond) O2 (g) CO2 (g)
(B)
(C)
N 2 (s) 3H 2 (g) 2NH 3 (g)
(D)
VMC/Thermodynamics
8
1 1 H 2 (g) F2 (g) HF(g) 2 2 1 CO (g) O2 (g) CO2 (g) 2
HWT/Chemistry
Vidyamandir Classes DATE :
TIME : 30 Minutes
MARKS : [ ___ /10]
TEST CODE : THERMO [8]
START TIME :
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.
2.
Trouton’s rule gives the relation between : (A) Tb and Tc (C) Enthalpy of vaporization and boiling point
4.
6.
7.
109 kcal is absorbed (D)
S 2.303 R
(B)
S R
(C)
S R
10.
zero
218 kcal is released
(D)
R S
For a particular reversible reaction at temperature T, H and S were found to be both +ve. If Te is the temperature at equilibrium, the reaction would be spontaneous when : (A) Te > T (B) T > Te (C) Te is 5 times T (D) T = Te Which of the following reaction define ? Gf (A)
C(diamond) O2 (g) CO2 (g)
(B)
(C)
H 4 P2 O7 H 2 O 2H 3 PO4
(D)
For a chemical reaction, G will always be negative if : (A) H and TS both are positive H negative and TS positive
Standard entropy of X2, Y2 and XY3 are 60, 40 and 50 JK
1 1 H 2 (g) F2 (g) HF(g) 2 2 1 SO2 (g) O2 (g) SO3 (g) 2 H and TS both are negative
(B)
H positive and TS negative
(D) 1
mol
1
, respectively. For the reaction,
1 3 X 2 Y2 XY3 , H 30kJ , to be at equilibrium, the temperature will be : 2 2 (A) 1250 K (B) 500 K (C) 750 K
9.
(D)
A plot of ln k against 1/T (abscissa) is expected to be a straight line with intercept on coordinate axis equal to :
(C) 8.
28.66 kJ
(C)
The bond energy of O – H bond is 109 kcal/mol. When amole of water is formed, then : (A) 109 kcal is released (B) 218 kcal is absorbed (C)
(A) 5.
Tb and critical pressure Normal boiling point and boiling point
For the reaction, 2H 2 (g) O2 (g) 2H 2 O (g); H 573.2 kJ The heat of decomposition of water per mole is : (A) 286.6 kJ (B) 573.2 kJ
3.
(B) (D)
(D)
1000 K
For which reaction change of entropy will be positive? (A)
H 2 (g) I 2 (g) 2HI(g)
(B)
HCl(g) NH 3 (g) NH 4 Cl(s)
(C)
NH 4 NO3 (s) N 2 O(g) 2H 2 O(g)
(D)
MgO(s) H 2 (g) Mg(s) H 2 O ( l )
Which is the correct expression, that relates changes of entropy with the change of pressure for an ideal gas at constant temperature in the following? p p p (A) S T p2 p1 (C) S nRT ln 2 (B) S nRT ln 1 (D) S 2.303 nRT ln 1 p1 p2 p2
VMC/Thermodynamics
9
HWT/Chemistry
Vidyamandir Classes DATE :
TIME : 30 Minutes
MARKS : [ ___ /10]
TEST CODE : THERMO [9]
START TIME :
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.
Considering the reaction, 6.
C(s) O2 (g) CO2 (g) 393.5 kJ the signs of H, S and G respectively are :
(A) (C) 2.
(B) (D)
–, +, + –, +, –
The correct relationship between free energy change in a reaction and the corresponding equilibrium constant Kc is : (A) G RT ln K c (B) G RT ln K c (C)
3.
+, –, – –, –, –
G RT ln K c
(D)
7.
G RT ln K c
8.
The direct conversion of A of B is difficult, hence it is carried out by the following shown path
What is the relation between E and K ? (A)
E
0.0591 log K (B) n
E
n log K 0.0591
(C)
E
2.303R log K (D) nF
E
2.303RT log K n
Unit of entropy is : (A)
JK 1 mol 1
(B)
J mol 1
(C)
J 1K 1 mol 1
(D)
JK mol 1
A schematic plot of ln Keq versus inverse of temperature for a reaction is shown below :
C D
Given;
A
B
S(A C) 50 eu S(C D) 30 eu S(B D) 20 eu
Where eu is entropy unit, then S(A B) is : (A) (C) 4.
+ 100 eu 100 eu
(B) (D)
The reaction must be : (A) Highly spontaneous at ordinary temperature (B) One with negligible enthalpy change (C) Endothermic (D) Exothermic
+ 60 eu 60 eu
For a chemical reaction, the free energy change ( G) is 9.
negative. The reaction is : (A) A spontaneous reaction (B) (C) (D) rates 5.
An equilibrium reaction A non-spontaneous reaction Characterized by rf = rb (where, rf and rb are of forward ad backward reaction respectively)
For the reaction at 298 K 10.
A(g) B(g) C(g) D(g)
VMC/Thermodynamics
(B) (D)
(B)
H and S both are ve
(C)
H and S both are ve
(D)
H is ve, S is ve
For a system in equilibrium, G 0 under conditions of constant : (A) Temperature and pressure (B) Temperature and volume (C) Pressure and volume (D) Energy and volume
H 29.8 kcal, S 0.100 kcal K 1 What is the value of G ? (A) 1 (C) 2
If an endothermic reaction is non-spontaneous at freezing point of water becomes feasible at its boiling point then : (A) H is ve, S is ve
0 4
10
HWT/Chemistry
Vidyamandir Classes DATE :
TIME : 30 Minutes
MARKS : [ ___ /10]
TEST CODE : THERMO [10]
START TIME :
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.
Molar heat change is 16J mol 1 K 1 , the boiling points of the liquid is : (A)
2.
375 C
(B)
375 K
(C)
273 K
(D)
102 C
The entropy change for the reaction H 2 (g) Cl 2 (g) 2HCl (g) will be : [Given that, S (HCl) 187 JK 1 mol 1
S (H 2 ) 131JK 1 mol 1 and S (Cl 2 ) 223 JK 1 mol 1 ] (A) 3.
8.
167 JK 1 mol 1
9336 cal
(B)
7386 cal
(C)
1936 cal
(D)
9336 cal
S decreases for gas
(D)
G increases for gas
400 K
(B)
350 K
(C)
298 K
(D)
250 K
209.4
(B)
109.4
(C)
250.0
(D)
209.4
G ve, E ve (D)
Which of the following statements is true? (A) G is always less than H
(B)
G is always more than H
(D)
G may be lesser, greater or equal to H
(C)
0
(D)
=0
H 0, S 0
(D)
H 0, S 0
G is always proportional to H
G ve, E ve
In a reversible process, Ssystem Ssurrouding is : (A)
10.
(D)
For spontaneity of a cell, which is correct? (A) G 0, E 0 (B) G ve, E 0 (C)
(C) 9.
167 JK 1 mol 1
The enthalpy change for the transition of liquid water to steam is 40.8 kJ mol 1 at 373 K . What is the entropy of vaporization of water? (A)
7.
(C)
H vap 30 kJ / mol and Svap 75 J mol 1 K 1 . Find temperature of vapour, at 1 atm. (A)
6.
20 JK 1 mol 1
Spontaneous adsorption of a gas on solid surface is an exothermic process because : (A) (B) S increases for gas H increases for system (C)
5.
(B)
The free energy for a reaction having H 31400 cal, S 32 cal K 1 mol 1 at 1000 C is : (A)
4.
20 JK 1 mol 1
>0
(B)
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