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Question

A and B are ideal gases. The molecular weights of A and B are in the ratio of 1: 4. The pressure of a gas mixture containing equal weights of A and B is P atm. What is the partial pressure (in atm) of B in the mixture.

A
P5
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B
P2
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C
P2.5
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D
3P4
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Solution

The correct option is B P5
PB=P.XB
No. of moles of gas is inversely proportional to molecular weight when an equal mass of gases are present.
Thus, no. of moles of A and B are in the ratio 4: 1
Mole fraction of B =1/5
Thus, PB=P5

So, the correct option is A

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