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Q. At $273\, K$ temperature and $76\, cm \,Hg$ pressure, the density of a gas is $1.964 \,gL ^{-1}$. The gas is

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Solution:

Molar mass of gas $( M )=\frac{d R T}{P}$
$=\frac{1.964 \times 0.0821 \times 273}{1}=44 \,g$
Hence, the gas is $CO _{2}$