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Question

100 ml of 0.1 M acetic acid is completely neutralised using a standard solution of NaOH. The volume of ethane obtained at STP after the complete electrolysis of the resulting solution is :

A
112 ml
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B
56 ml
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C
224 ml
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D
560 ml
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Solution

The correct option is D 112 ml
CH3COOH+NaOHCH3COONa+H2O
Number of moles of sodium acetate
=100ml1000ml/L×0.1mol/L=0.01mol
2CH3COONahydrolysis−−−−−−electrolysisCH3CH3+2CO2+2NaOH+H2

Number of moles of ethane are one half the number of moles of sodium acetate. Number of moles of ethane =0.012=0.005 moles.
At STP, 1 mole of ethane occupies a volume of 22400 ml. Hence, 0.005 moles of ethane will occupy a volume of 0.005×22400=112 ml.

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