# 10.25 What happens when (i) sodium metal is dropped in water ? (ii) sodium metal is heated in free supply of air ? (iii) sodium peroxide dissolves in water ?

(i) When sodium metal dropped into water it reacts rapidly and forms sodium hydroxide and hydrogen gas.

the chemical reaction is - $2Na+2H_{2}O\rightarrow 2NaOH +H_{2}$

(ii) sodium metal heated in the free supply of water-

Sodium reacts vigorously with oxygen and forming sodium peroxides.

Reaction- $2Na+O_{2}\rightarrow Na_{2}O_{2}$

(iii) when sodium peroxide dissolved in water it hydrolysed and produce sodium hydroxide and hydrogen peroxide.

Reaction-  $Na_{2}O_{2}+2H_{2}O\rightarrow 2NaOH+H_{2}O_{2}$

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