Q9 / 180 · COMEDK 2018 · Chemistry

The density of a gas is $1.964 \mathrm{~g} \mathrm{dm}^{-3}$ at $273 \mathrm{~K}$ and $76 \mathrm{~cm}$ Hg. The gas is

  • A
    $\mathrm{CH}_{4}$
  • B
    $\mathrm{C}_{2} \mathrm{H}_{6}$
  • Correct answer
    C
    $\mathrm{CO}_{2}$
  • D
    Xe

Solution

$M=\frac{d R T}{p}=\frac{1.964 \times 0.0821 \times 273}{1}$ $$ M=44 \mathrm{~g} / \mathrm{mol} $$ $\therefore$ So, gas is $\mathrm{CO}_{2}$.

Hence, the correct answer is option: 'C'.

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