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

The polarising power of Mg is close to that of –

1. Na                                       

2. Cs

3. Li                                         

4. K

Sodium metal cannot be stored under-

(1) Benzene                                         

(2) Kerosene

(3) Alcohol                                           

(4) Toluene

Sodium looses its lustre on exposure to air due to formation of-

(1) $N{a}_{2}O,<mspace\; width="1em"></mspace>$NaOH and $N{a}_{2}C{O}_3$                     

(2) $N{a}_{2}O$ and NaOH

(3) $N{a}_{2}O$ and $N{a}_{2}C{O}_3$                                 

(4) NaOH and $N{a}_{2}C{O}_3$

Sodium oxide reacts with water violently forming NaOH. On heating above 400ºC, it produces

(1) Monoxide and peroxide

(2) Monoxide and metallic sodium

(3) Peroxide and metallic sodium

(4) Monoxide and oxygen

Alkaline earth metals form hydrated crystalline solids such as $MgC{l}_2.6H_{2}O,<mspace\; width="1em"></mspace>CaC{l}_2.6H_{2}O$. This is due to-

(1) Smaller ionic size

(2) Increased charge on ions

(3) Higher hydration enthalpies

(4) High oxidation potential

The commercial salt is purified by passing-

(1) $H_{2}S$ gas through an alkaline solution of salt

(2) HCl gas through a saturated solution of salt

(3) $H_2$ gas through a solution of salt

(4) $C{l}_2$ gas through a saturated solution of salt