Jee 2014 Booklet4 Hwt s Block Elements

August 28, 2017 | Author: varunkohliin | Category: Sodium, Sodium Hydroxide, Lithium, Potassium, Bicarbonate
Share Embed Donate


Short Description

Jee 2014 Booklet4 Hwt s Block Elements...

Description

Vidyamandir Classes

DATE :

  MARKS :    10 

IITJEE :

NAME :

TIME : 25 MINUTES

TEST CODE : S-BLK [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.

2.

3.

Molecular formula of Glauber’s salt is : (A) MgSO 4 . 7H 2 O (B) CuSO 4 . 5H 2 O Washing soda is : (A) Na 2 CO3

(B)

(C)

Na 2 CO3 . 10H 2 O (C)

On heating sodium carbonate …… is evolved. (A) CO2 (B) CO

(C)

Na 2SO 4 . 10H 2 O (D)

FeSO4 . 7H 2 O

KHCO3

(D)

NaHCHO3

H2O

(D)

NO gas

4.

Sodium carbonate can be manufactured by Solvay process but potassium carbonate cannot be prepared because : (A) K2CO3 is more soluble (B) K2CO3 is less soluble (C) KHCO3 is more soluble than NaHCO3 (D) KHCO3 is less soluble than NaHCO3

5.

Which of the following represents correct order of decreasing E O OX or reducing nature? (A) (C)

6.

7.

8.

9.

10.

Li > Na > K > Rb Rb > Li > Na > K

Alkali metals are characterized by : (A) good conductors of heat and electricity (C) low oxidation potentials

(B) (D)

Rb > K > Na > Li Li > Rb > K > Na

(B) (D)

high melting points high ionization potentials

A solution of sodium in liquid ammonia is strongly reducing due to the presence of : (A) sodium atoms (B) sodium hydride (C) sodium amide

(D)

solvated electrons

Sodium metal can be stored under. (A) benzene (B)

(D)

water

(C)

alcohol

Alkali metals are powerful reducing agents because : (A) these are metals (C) their ionic radii are large

(B) (D)

there are monovalent their ionization potentials are low

Sodium carbonate is prepared by : (A) Solvay process (B)

(C)

Contant process

VMC/s-Block Elements

kerosene

Kolbe’s process

16

(D)

Nessler’s process

HWT/Chemistry

Vidyamandir Classes

DATE :

  MARKS :    10 

IITJEE :

NAME :

TIME : 25 MINUTES

TEST CODE : S-BLK [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.

An element having electronic configuration 1s2  2s2 2p6 , 3s2 3p6 , 4s1 will form : (A)

2.

acidic oxide

(B)

basic oxide

(C)

amphoteric oxide

(D)

The products of electrolysis of concentrated common salt solution are : (A) Na + Cl2 (B) H2 + O2 (C) NaOH + H2 + Cl2 (D)

neutral oxide NaOH + Cl2 + O2\

3.

Elements in the first column of the periodic table are called alkali metals. These metals have : (A) A single valence electron (B) One electron less than an inert gas configuration (C) high melting points (D) high ionization potentials

4.

Potassium when heated strongly in oxygen, it forms : (A) K2O (B) KO2

(C)

K2O2

(D)

5.

The reaction of sodium is highly exothermic with water. The rate of reaction is lowered by : (A) lowering the temperature (B) mixing with alcohol (C) mixing with acetic acid (D) making an amalgam

6.

RbO2 is : (A) Superoxide and paramagnetic (C) Peroxide and paramagnetic

(B) (D)

KO

Superoxide and diamagnetic Peroxide and diamagnetic

7.

KOH is preferably used to absorb CO2 gas because : (A) KHCO3 is soluble in water while NaHCO3 is sparingly soluble in water (B) KOH is cheaper than NaOH (C) KOH is stronger base than NaOH (D) KOH is more soluble than NaOH in water

8.

When a concentrated solution of ammonia is saturated with sodium chloride in the presence of pieces of dry ice, a water cloud is formed. This is due to : (A) precipitation of sodium hydrogen carbonate form the reaction mixture (B) precipitation of ammonium carbonate (C) precipitation of ammonium hydrogen carbonate from the reaction mixture (D) precipitation of sodium carbonate from the reaction mixture : [Hint : NH 3  H 2 O  CO2 (dry ice)   Na 4 HCO3 ;

9.

10.

NaCl  NH 4 HCO3   NaHCO3  NH 4 Cl]

When ammonical common salt solution is saturated with carbon dioxide we obtain : (A) (B) (C) NH 4 HCO3 (NH 4 )2 CO3 NaHCO3

(D)

Na 2 CO3

Sodium carbonate solution is alkaline due to : (A)

hydrolysis of Na 

(B)

hydrolysis of CO3

(C)

hydrolysis of both Na  and CO3 ions

(D)

None of the above

VMC/s-Block Elements

17

HWT/Chemistry

Vidyamandir Classes

DATE :

  MARKS :    10 

IITJEE :

NAME :

TIME : 25 MINUTES

TEST CODE : S-BLK [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.

3.

4.

5.

Which of the following has lowest thermal stability ? (A) (B) Li 2 CO3 Na 2 CO3

(C)

K 2 CO3

(D)

Rb2 CO3

Which of the following compound is (are) soluble in water ? (A) (B) LiF (C) Li 2 O

Both of them

(D)

None of them

The most abundant alkali metal in nature is : (A) lithium (B) sodium

(C)

potassium

(D)

caesium

When sodium hydroxide solution is electrolysed : (A) hydrogen is discharged at cathode (C) sodium is liberated at anode

(B) (D)

hydrogen is discharged at anode no hydrogen is liberated

LiAlH4 is used as : (A) an oxidizing agent (C) a mordant

(B) (D)

a reducing agent a water softener

6.

Sodium sulphate is soluble in water whereas barium sulphate is sparingly soluble because : (A) The hydration energy of sodium sulphate is more than its lattice energy (B) The lattice energy of barium sulphate is less than its hydration energy (C) The lattice energy has no role to play is solubility (D) the hydration energy of sodium sulphae is less than its lattice energy

7.

Which of the following increases in magnitude as the atomic number of alkali metals increases ? (A) Electronegativity (B) First ionization potential (C) Ionic radius (D) Melting point

8.

Sodium has, as compared to potassium : (A) less electronegativity (C) larger atomic radius

(B) (D)

More ionization potential lower melting point

The metallic luster exhibited by sodium is explained by : (A) diffusion of sodium ions (C) existence of free protons

(B) (D)

oscillation of mobile valence electrons existence of body centred cubic lattice

9.

10.

In the electrolysis of NaCl solution for the manufacture of NaOH, the ion discharged at cathode is : (A)

Na 

VMC/s-Block Elements

(B)

Cl 

(C)

18

H

(D)

O2 

HWT/Chemistry

Vidyamandir Classes

DATE :

  MARKS :    10 

IITJEE :

NAME :

TIME : 25 MINUTES

TEST CODE : S-BLK [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.

When sodium is added in scanty water, it catches fire. In this process which one of the following burns ? (A) Na (B) (C) CO (D) H 2O H2

2.

Among LiCl, RbCl, BeCl2 and MgCl2 the compounds with greatest and least ionic character respectively are : (A) LiCl, RbCl (B) RbCl, BeCl2 (C) RbCl, MgCl2 (D) MgCl2, BeCl2

3.

Stable oxide is obtained by heating the carbonate of the elements : (A) Li (B) Na (C)

K

(D)

Rb

Ease with which hydrides are formed from Li to Cs : (A) Decreases (B) increases

remains the same

(D)

none of these

4.

5.

(C)

Thermal stability of hydrides of first group elements follows the order : (A) (B) LiH  NaH  KH  RbH LiH  KH  NaH  RbH (C)

LiH  RbH  KH  NaH

(D)

LiH  KH  RbH  NaH

6.

There occurs loss of mass when a mixture of Li2CO3 and Na2CO3 . 10H2O is heated strongly. The loss of mass is due to : (A) Decomposition of Li2CO3 only (B) Loss of water by Na2CO3 . 10H2O (C) both (A) and (B) (D) None of these

7.

In certain matters, lithium differs from other alkali metals, the main reason for this is ; (A) small size of lithium atom (B) extremely high electropositivity of Li (C) greater hardness of Li (D) hydration of Li+, ion

8.

Identify the correct statement. Element sodium : (A) Can be prepared and isolated by electrolyzing an aqueous solution of sodium chloride (B) is a strong oxidizing agent (C) is insoluble in ammonia (D) is easily oxidized

9.

Which reacts directly with nitrogen to form nitride ? (A) Na (B) Li

(C)

K

(D)

Rb

Which of the following has the highest melting point ? (A) NaCl (B) NaF

(C)

NaBr

(D)

Nal

10.

VMC/s-Block Elements

19

HWT/Chemistry

Vidyamandir Classes

DATE :

  MARKS :    10 

IITJEE :

NAME :

TIME : 25 MINUTES

TEST CODE : S-BLK [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.

2.

3.

4.

5.

6.

7.

8.

In view of their low ionization energies, the alkali metals are : (A) weak oxidizing agents (B) (C) strong oxidizing agent (D)

strong reducing agent weak reducing agents

Which of the following has lowest melting point ? (A) Li (B) Na

K

(D)

Cs

When sodium is treated with sufficient oxygen/air, the product obtained is : (A) Na2O (B) Na2O2 (C) NaO2

(D)

NaO

Which of the following has the least ionization potential ? (A) Li (B) He (C)

N

(D)

Zn

Smallest among these species is : (A) hydrogen (B)

(C)

lithium

(D)

lithium ion

(B) (D)

Water vapours None of the above

10.

helium

Sodium carbonate on heating gives : (A) CO2 (C) Carbon dioxide + water vapour

On dissolving moderate amount of sodium metal in liquid NH 3 at low temperature, which one the following does not occur ? (A)

Blue coloured solution is obtained

(C)

Liquid NH3 becomes good conductor of electricity

(B)

The solubility of alkali metal hydroxides follows the order : (A) (B) LiOH  NaOH  KOH  RbOH  CsOH (C)

9.

(C)

LiOH  CsOH  RbOH  NaOH  KOH

(D)

The magnetic moment of KO2 at room temperature is …….. BM (A) 1.41 (B) 1.73 (C)

Na  ions are formed in the solution (D)

Liquid NH 3 remains diamagnetic

LiOH  NaOH  KOH  RbOH  CsOH

None of the above

2.23

(D)

2.64

The sequence of ionic mobility in aqueous solution is : (A)

Rb   K   Cs  Na 

(B)

Na   K   Rb   Cs

(C)

K   Na   Rb   Cs

(D)

Cs  Rb   K   Na 

VMC/s-Block Elements

20

HWT/Chemistry

View more...

Comments

Copyright ©2017 KUPDF Inc.