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Which gas diffuses most slowly under identical conditions?

A $H X_{2}$
B $He$
C $N X_{2}$
D $Cl X_{2}$

Answer: D

Graham's law: rate

\propto 1/ M

. Molar masses are 2, 4, 28 and 71.

Cl X_{2}

is the heaviest and so diffuses most slowly.

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