The density of a gas A is twice that of gas B at the same temperature. The molecular weight of gas B is twice that of gas A. The ratio of pressures of gases A and B will be:
A
1:6
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B
1:1
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C
4:1
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D
1:4
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Solution
The correct option is C4:1 Given, density of gas Adensity of gas B=(dA)(dB) = 21; molecular mass of gas A molecular mass of gas B=(MA)(MB) = 12 PM=nRT where P = pressure of the gas A and B dividing, =PAPB×MAMB=dAdB×RTRT =PAPB×12=2 PAPB=41