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

Lattice energy is lowest for –

1. LiF                                                       

2. NaCl

3. KBr                                                       

4. CsI

MgO is a-

(1) Acidic oxide                                     

(2) Basic oxide

(3) Neutral oxide                                   

(4) Amphoteric oxide

Which of the following statements is wrong ?

(1) Lithium nitrate on heating gives lithium nitrite and $O_2$.

(2) Sodium oxide, $N{a}_{2}O$ is obtained on heating sodium azide with sodium nitrite.

(3) Potassium cyanide dissolves silver in presence of air or $O_2$.

(4) Potassium formate is formed when moist $C{O}_2$ reacts with potassium hydride.

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

(1) $L{i}^{+}\left(aq\right)>N{a}^{+}\left(aq\right)>K^{+}\left(aq\right)>R{b}^{+}\left(aq\right)>C{s}^{+}\left(aq\right)$

(2) $L{i}^{+}\left(aq\right)>N{a}^{+}\left(aq\right)<K^{+}\left(aq\right)<R{b}^{+}\left(aq\right)<C{s}^{+}\left(aq\right)$

(3) $L{i}^{+}\left(aq\right)>N{a}^{+}\left(aq\right)>K^{+}\left(aq\right)>R{b}^{+}\left(aq\right)<C{s}^{+}\left(aq\right)$

(4) $L{i}^{+}\left(aq\right)<N{a}^{+}\left(aq\right)<K^{+}\left(aq\right)<R{b}^{+}\left(aq\right)<C{s}^{+}\left(aq\right)$

Among the following groups of oxides, the group containing oxides that cannot be reduced by carbon to give the respective metals is –

(1) PbO, $F{e}_3{O}_4$                                   

(2) CaO, $K_{2}O$

(3) $C{u}_{2}O, Sn{O}_2$                                   

(4) $F{e}_2{O}_3, ZnO$

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

Which of the following statement is false regarding saline hydrides –

1. They conduct electricity in molten state

2. They dissolve in water and liberate $H_2$

3. They are used as reducing agents

4. They are covalent in nature

An amphoteric oxide among the following is-

1. CaO                                                     

2. SrO

3. BeO                                                     

4. MgO

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.