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Question

How is : (a) methane and (b) ethane prepared in the laboratory?

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Solution

(a) Laboratory preparation of methane: When the mixture of sodium ethanoate and soda lime is taken in a hard glass test tube and heated, the gas evolved is methane. It is collected by downward displacement of water.

CH subscript 3 COONa plus NaOH rightwards arrow with Cao comma 300 degree straight C on top Na subscript 2 CO subscript 3 plus CH subscript 4

(b) Laboratory preparation of ethane: When the mixture of sodium propionate and soda lime is taken in the boiling tube and heated the ethane gas is evolved. It is also collected by downward displacement of water.

straight C subscript 2 straight H subscript 5 COONa plus NaOH rightwards arrow with CaO comma 300 degree straight C on top Na subscript 2 CO subscript 3 plus straight C subscript 2 straight H subscript 6


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