Which of the following gases has the highest value of rms velocity at $298 K$ ?

C H_{4}

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C O

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{C l}_{2}

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C O_{2}

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Solution

The correct option is D $C H_{4}$
$V_{r m s} = \sqrt{\frac{3 R T}{M}}$

Velocity will be highest for lowest molecular mass. Hence, $C H_{4}$ will have maximum rms velocity.

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