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 |
 58%
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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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Which of the following statement is false regarding saline hydrides –

1. They conduct electricity in molten state

2. They dissolve in water and liberate H2

3. They are used as reducing agents

4. They are covalent in nature

Subtopic:  Physical Properties |
 71%
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An amphoteric oxide among the following is-

1. CaO                                                     

2. SrO

3. BeO                                                     

4. MgO

Subtopic:  Physical Properties |
 88%
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The incorrect statement among the following regarding Lithium is that-

1. The hydroxide, carbonate and nitrate decompose to give the oxide on heating.

2. It is the most electronegative element of group IA.

3. The hydrogen carbonate cannot be isolated as a stable solid.

4. It forms superoxide.

Subtopic:  Physical Properties |
 81%
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Which one of the following is most stable in ether-

(1) BeCl2                                           

(2) CaCl2

(3) SrCl2                                           

(4) None of these

Subtopic:  Physical Properties |
 75%
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