Which one of the following on hydrolysis, gives the corresponding metallic hydroxide, H2O2 and O2 ?

Question

Which one of the following on hydrolysis, gives the corresponding metallic hydroxide, H2O2 and O2 ? (A)  Li2O  (B)  Na2O2  (C)  NaO2  (D)  Na2O

Tardigrade Admin · Accepted Answer

On hydrolysis, alkali metal oxides give the corresponding metallic hydroxides.

L i_{2} O + H_{2} O 2 L i O H

N a_{2} O + H_{2} O 2 N a O H

The peroxides of alkali metals give the corresponding metallic hydroxide and

H_{2} O_{2}

.

N a_{2} O_{2} + 2 H_{2} O 2 N a O H + H_{2} O_{2}

Whereas, the superoxides of alkali metals give the corresponding metallic hydroxide,

H_{2} O_{2}

and

O_{2}

2 N a O_{2} + 2 H_{2} O 2 N a O H + H_{2} O_{2} + O_{2}

B e (O H)_{2}

cannot be prepared by hydrolysis of

B e O,

as it is insoluble in water.

Q. Which one of the following on hydrolysis, gives the corresponding metallic hydroxide, $H_{2} O_{2}$ and $O_{2}$ ?