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) $C{u}_{2}O,<mspace\; width="1em"></mspace>Sn{O}_2$                                   

(4) $F{e}_2{O}_3,<mspace\; width="1em"></mspace>ZnO$

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.

Which one of the following is most stable in ether-

(1) $BeC{l}_2$                                           

(2) $CaC{l}_2$

(3) $SrC{l}_2$                                           

(4) None of these

The strongest reducing agent is-

(1) Be                                                   

(2) Mg

(3) Sr                                                   

(4) Ba

The largest value of ${\mathrm{K}}_{\mathrm{sp}}$ among the following is -

1. ${\mathrm{BeSO}}_4$                                           

2. ${\mathrm{MgSO}}_4$

3. ${\mathrm{CaSO}}_4$                                       

4. ${\mathrm{BaSO}}_4$

What are $\alpha$, $\beta$ and $\gamma$ in the following equation

$\alpha K_4\left[Fe{\left(CN\right)}_6\right]+\beta <mspace\; width="1em"></mspace>K_{2}C{O}_3+\gamma S\stackrel{heat}{\to }$  Products ?

the products are Fe, $C{O}_2,<mspace\; width="1em"></mspace>$KCNO and KSCN.

(A) 1, 2, 3                                               

(B) 2, 1, 5

(C) 1, 1, 5                                               

(D) 2, 2, 3

The correct order of increasing ionic character is –

(1) $BeC{l}_2<MgC{l}_2<CaC{l}_2<<mspace\; width="1em"></mspace>BaC{l}_2$

(2) $BeC{l}_2<MgC{l}_2<BaC{l}_2<CaC{l}_2$

(3) $BeC{l}_2<BaC{l}_2<MgCl<CaC{l}_2$

(4) $BaC{l}_2<CaC{l}_2<MgC{l}_2<BeC{l}_2$