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Question

If a mixture containing 3 moles of hydrogen and 1 mole of nitrogen is converted completely into ammonia, the ratio of initial and final volume under the same temperature and pressure would be

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

The correct option is C 2:1
The reaction for conversion is
N2+3H22NH3
Here, n1=3+1=4n2=2Initialvolume=V1FinalVolume=V2
Applying Avagadro's Law, we get
V1n1=V2n2V1V2=n1n2V1V2=42=21So,V1:V2=2:1.

So, correct answer is option C.

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