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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Ionic conductances of hydrated M+ ions are in the order-

(1) Li+aq>Na+aq>K+aq>Rb+aq>Cs+aq

(2) Li+aq>Na+aq<K+aq<Rb+aq<Cs+aq

(3) Li+aq>Na+aq>K+aq>Rb+aq<Cs+aq

(4) Li+aq<Na+aq<K+aq<Rb+aq<Cs+aq

Subtopic:  Physical Properties |
 69%
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Among the following groups of oxides, the group containing oxides that cannot be reduced by carbon to give the respective metals is –

(1) PbO, Fe3O4                                   

(2) CaO, K2O

(3) Cu2O, SnO2                                   

(4) Fe2O3, ZnO

Subtopic:  Physical Properties |
 59%
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The number of crystal water in Gypsum, Plaster of Paris and Epsom salt respectively are-

1. 2, 0.5, 7                                             

2. 7, 2, 1

3. 7, 0.5, 2                                             

4. 3, 4, 2

Subtopic:  Compounds of Ca and Na -Preparations, Properties & Uses |
 84%
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