In the reaction M+O2MO2 (superoxide) the metal is -

1. Li                 

2. Na

3. K                 

4. Ba 

Subtopic:  Chemical Properties |
 82%
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The reaction of sodium with water is highly exothermic. The rate of reaction can be lowered by-

(1) Decreasing the temperature 

(2) Mixing with alcohol

(3) Mixing with acetic acid 

(4) Making an amalgam

Subtopic:  Physical Properties |
 59%
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Sodium reacts with water less vigorously than potassium because-

1. It has a higher atomic weight.

2. It is less electropositive .

3. It is more electronegative. 

4. It is a metal .

Subtopic:  Chemical Properties |
 74%
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The correct relation about the density of Na and K is 

1. Na > K                                                     

2. Na = K

3. K > Na                                                     

4. Li > K

Subtopic:  Physical Properties |
 78%
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Which of the following does not give an oxide on heating-

(1) MgCO3                                                   

 

(2) Li2CO3

(3) ZnCO3                                                   

 

(4) K2CO3 

Subtopic:  Chemical Properties |
 56%
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The reason for a lower basicity of hydroxides of alkaline earth metals than alkali metals is : 

1. Alkali metals form ionic compounds.

2. The bond strength of oxygen is more for alkali metals.

3. The electropositivity of alkali metals is more than alkaline earth metals.

4. The electropositivity of alkali metals is less than alkaline earth metals.

Subtopic:  Physical Properties |
 80%
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In K+F- ionic radius of F- is more while atomic radius of K+ is –

(1) Less than F-

(2) More than F-

(3) Equal to F-

(4) None of these

Subtopic:  Physical Properties |
 55%
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Lattice energy is lowest for –

1. LiF                                                       

2. NaCl

3. KBr                                                       

4. CsI

Subtopic:  Physical Properties |
 71%
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MgO is a-

(1) Acidic oxide                                     

(2) Basic oxide

(3) Neutral oxide                                   

(4) Amphoteric oxide

Subtopic:  Chemical Properties |
 78%
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Which of the following statements is wrong ?

(1) Lithium nitrate on heating gives lithium nitrite and O2.

(2) Sodium oxide, Na2O is obtained on heating sodium azide with sodium nitrite.

(3) Potassium cyanide dissolves silver in presence of air or O2.

(4) Potassium formate is formed when moist CO2 reacts with potassium hydride.

Subtopic:  Chemical Properties |
 69%
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