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Question

A gas mixture contains acetylene and carbondioxide. 20 litres of this mixture requires 20 litres of oxygen for complete combustion. If all gases are measured under similar conditions of temperature and pressure, the percentage of acetylene in the mixture is:

A
50%
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B
40%
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C
60%
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D
75%
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Solution

The correct option is B 40%
CO2 won't get undergo combustion.

The reaction for the combustion of acetylene is C2H2+2.5O22CO2+H2O.
The combustion of 1 mole (22.4 L) of acetylene will require 2.5 moles (2.5×22.4=56L)of oxygen.
20L of oxygen will combine with 22.456×20=8L of acetylene.
Thus, the mixture contains 8L or 820×100=40% acetylene.

So, the correct option is B

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