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Question

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?


Solution

(i) When sodium metal is dropped in water, an exothermic reaction occurs due to which the evolved hydrogen gas catches fire.
$$\displaystyle 2Na(s) + 2H_2O(l) \rightarrow 2NaOH (aq) + H_2 $$
(ii) sodium metal is heated in free supply of air to form sodium peroxide and sodium oxide.
$$\displaystyle 2Na(s) + O_2(g) \rightarrow Na_2O (s) $$ minor product
$$\displaystyle Na_2O_2(s) + 2H_2O(l) \rightarrow 2NaOH (aq) + H_2O_2 (l) $$
(iii) sodium peroxide dissolves in water to form hydrogen peroxide.
$$\displaystyle Na_2O_2(s) + 2H_2O(l) \rightarrow 2NaOH (aq) + H_2O_2(l) $$

Chemistry
NCERT
Standard XI

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