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.

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. ${\mathrm{BaSO}}_4$

The polarising power of Mg is close to that of –

1. Na                                       

2. Cs

3. Li                                         

4. K

The incorrect statement among the following is-

1. Alkali metals are more electropositive than alkaline earth metals.

2. Alkaline earth metals are denser and harder than alkali metals.

3. An alkali metal's electronic configuration is ns¹ and an alkaline earth metal's electronic configuration is ns²

4. The first IP of alkali metals is more than that of alkaline earth metals.

Potassium is kept-

1. Under cold water.                                 

2. In ammonia.

3. In alcohol.                                         

4. In kerosene.

Nitrolim (a nitrogenous fertilizer) is a mixture of-

1. Calcium carbide and calcium cyanamide.

2. Calcium oxide and calcium carbide.

3. Calcium cyanamide and carbon.

4. Calcium oxide and carbon.

The strongest base among the following is-

1. $\mathrm{Al}{\left(\mathrm{OH}\right)}_3$                                   

2. $\mathrm{Mg}{\left(\mathrm{OH}\right)}_2$

3. $\mathrm{Ca}{\left(\mathrm{OH}\right)}_2$                                 

4. $\mathrm{Ba}{\left(\mathrm{OH}\right)}_2$

Ca, on exposure of the moist air, forms a layer on its surface as : 

1. ${\mathrm{CaCO}}_3$                                             

2. $\mathrm{Ca}{\left(\mathrm{OH}\right)}_2$

3. ${\mathrm{CaCO}}_3.\mathrm{Ca}{\left(\mathrm{OH}\right)}_2$                               

4. CaO

The incorrect statement regarding Be(II group) is -

1. It forms an ionic carbide.

2. Its carbonate decomposes on heating.

3. Its halides are covalent.

4. It is easily attacked by water.