Write a balanced chemical equation for each of the following :
(i) Burning of ethane in plentiful supply of air.
(ii) Action of water on Calcium carbide.
(iii) Heating of Ethanol at $170^{o} C$ in the presence of conc. Sulphuric acid.

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Solution

(i) $2 C_{2} H_{6} + 7 O_{2} \to 4 C O_{2} + 6 H_{2} O$
Carbon dioxide and water are obtained.
(ii) $C a C_{2} + 2 H_{2} O \to C a (O H)_{2} + C_{2} H_{2}$
Calcium hydroxide and acetylene are formed.
(iii) $C_{2} H_{5} O H + H_{2} S O_{4} \to C_{2} H_{5} H S O_{4} + H_{2} O$
$C_{2} H_{5} H S O_{4} \to C_{2} H_{4} + H_{2} S O_{4}$
Ethene and sulphuric acid are the products formed.

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