A mixture of two gases CO and $N_{2}$ are present in a container in 2:1 volume ratio. The vapour density of mixture is:

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Solution

The correct option is D 14
Molar mass of mixture $= \frac{28 \times 2 + 28 \times 1}{2 + 1} = 28 g m o l^{- 1}$
and

as molar mass $= 2 \times vapour density$ ,

so, Vapour density $= \frac{28}{2} = 14$

Hence, the correct option is $D$

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