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NEET 2015 (AIPMT) · Gas Laws & Ideal Gas Equation

Gas Laws & Ideal Gas Equation question from NEET 2015 (AIPMT)

Q74NEET 2015 · AIPMTMedium

Gas Laws & Ideal Gas Equation

Two vessels separately contain two ideal gases A and B at the same temperature, the pressure of A being twice that of B. Under such conditions, the density of A is found to be 1.5 times the density of B. The ratio of molecular weight of A and B is

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Answer: (d)

$\rho = \frac{PM}{RT} \Rightarrow M \propto \frac{\rho}{P}$ at the same $T$ .
$\frac{M_A}{M_B} = 1.5 \times \frac{1}{2} = \frac{3}{4}$ .
So the answer is (d) $\frac{3}{4}$ .

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