Which of the following statements are false ?

1. ${\mathrm{BeCl}}_2$ is a linear molecule in the vapour state
    but it is polymeric form in the solid state

2. Calcium hydride is called hydrolith

3. Carbides of both Be and Ca react with water
    to form acetylene

4. Oxides of both Be and Al are amphoteric 

The compound (s) formed upon combustion of sodium metal in excess air is (are)

1. ${\mathrm{Na}}_2{\mathrm{O}}_2$

2. ${\mathrm{Na}}_3\mathrm{N}$

3. ${\mathrm{NaO}}_2$

4. NaOH

The suspension of slaked lime in water is known as

1. Lime water

2. Quick lime

3. Milk of lime

4. Washing of lime

In context with beryllium, which one of the following statements is incorrect?

1.  It is rendered passive by nitric acid

2.  It forms ${\mathrm{Be}}_2\mathrm{C}$

3. Its salts rarely hydrolyse

4.  Its hydride is electron-deficient and polymeric

Which of the following oxides is most acidic in nature?

1. MgO

2. BeO

3. BaO

3. CaO

On heating which of the following releases CO₂ most easily?

1. ${\mathrm{K}}_2{\mathrm{CO}}_3$

2. ${\mathrm{Na}}_2{\mathrm{CO}}_3$

3. ${\mathrm{MgCO}}_3$

4. ${\mathrm{CaCO}}_3$

Which one of the alkali metals forms only, the normal oxide, M₂O on heating in air?

1. Rb

2. K

3. Li

4. Na