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Question

A gaseous mixture of propane and butane of volume 3 litre on complete combustion produces 11.0 litre CO2 under standard conditions of temperature and pressure. The ratio of volume of butane to propane is:

A
1:2
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B
2:1
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C
3:2
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D
3:1
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Solution

The correct option is B 2:1
Consider, volume of propane is V
C3H8V+5O25V3CO23V+4H2O
C4H103V+5O2132(3V)4CO24(3V)+4H2O
3L of propane and butane reacts with oxygen to give 11 L of CO2
3V+ 4(3-V)=11
Volume of propane V=1
Volume of butane 3-1=2
Ratio of volume of butane to propane that reacts with oxygen is 2:1

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