The density of neon gas will be highest at :

STP

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0^{\circ} C, 2 a t m

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273^{\circ} C, 1 a t m

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273^{\circ} C, 2 a t m

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Solution

The correct option is B $0^{\circ} C, 2 a t m$
According to ideal gas equation,
$P = \frac{n}{V} R T = \frac{w}{m V} = R T$
$P = \frac{d R T}{m}$
$d \propto \frac{P}{T}$
So, neon has the highest density at $0^{o} C, 2 a t m .$

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