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Ideal Gas Equation

At S.T.P. the...

Question

At S.T.P. the density of a gas X is three times that of gas Y while molecular mass of gas Y is twice that of X. The ratio of pressures of X and Y will be

A

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B

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C

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D

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Solution

The correct option is A
$P M = d R T$
or, $= \frac{P_{x} M_{x}}{3 d_{y}} = \frac{P_{y} 2 M_{X}}{d_{y}}$
or, $\frac{P_{x}}{P_{y}} = 6$

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