Write balanced chemical equations for each of the following :
(i) The action of warm water on AlN.
(ii) The action of hot and concentrated nitric acid on copper.
(iii) The action of hydrochloric acid on sodium bicarbonate.
(iv) The action of dilute sulphuric acid on sodium sulphite.
(v) Preparation of ethanol from ethyl chloride.

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Solution

(i) $A l N + 3 H_{2} O \to A l (O H)_{3} + N H_{3}$
(ii) $C u + 4 H N O_{3} \to C u (N O_{3})_{2} + 2 H_{2} O + 2 N O_{2}$
(iii) $N a H C O_{3} + H C l \to N a C l + H_{2} O + C O_{2}$
(iv) $N a_{2} S O_{3} + H_{2} S O_{4} \to N a_{2} S O_{4} + H_{2} O + S O_{2}$
(v) $C_{2} H_{5} C l + K O H \to C_{2} H_{5} O H + K C l$

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