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Question

Two seperate bulbs contain ideal gases P and Q, respectively maintained at the same temperature. The density of gas P is twice of that of the Q, and the molecular weight of the gas P is half of that of the gas Q. The ratio of the pressure of gas P to that of gas Q is

A
2
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B
1/2
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C
4
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D
1/4
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Solution

The correct option is C 4
p=dRTM
As given in the question,
The density of gas P is twice of that of the Q, and the molecular weight of the gas P is half of that of the gas Q.
On substituting the values, in the above formula, we get
pPpQ=dPdQ×MQMP=2×112=4

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