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Q.

At constant temperature,density of gas(A) is twice that of gas (B). Molar mass of ‘A’ is half that of ‘B’.  Ratio of their pressures,  PA/PB  is equal to

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a

¼

b

1

c

4

d

2

answer is C.

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Detailed Solution

PM =dRT

dA = 2dB and MB = 2MA

\frac{{{P_A}}}{{{P_B}}} = \frac{{{d_A}{M_B}}}{{{d_B}{M_A}}} = 4

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