Q106 / 200 · MHT CET - Medical 2026 (21 April Shift 1) · Chemistry
Which of the following gases has high vapour density at same temperature and pressure?
- A$\text{H}_2$
- B$\text{O}_2$
- Correct answerC$\text{Cl}_2$
- D$\text{CH}_4$
Solution
Vapour density is directly proportional to the molar mass of the gas, as $\text{Vapour Density} = \dfrac{\text{Molar Mass}}{2}$.
Calculating the molar mass for each given gas:
$\text{H}_2 = 2 \text{ g/mol}$
$\text{O}_2 = 32 \text{ g/mol}$
$\text{Cl}_2 = 71 \text{ g/mol}$
$\text{CH}_4 = 16 \text{ g/mol}$
Since $\text{Cl}_2$ has the highest molar mass, it has the highest vapour density.
Answer: $\text{Cl}_2$
Calculating the molar mass for each given gas:
$\text{H}_2 = 2 \text{ g/mol}$
$\text{O}_2 = 32 \text{ g/mol}$
$\text{Cl}_2 = 71 \text{ g/mol}$
$\text{CH}_4 = 16 \text{ g/mol}$
Since $\text{Cl}_2$ has the highest molar mass, it has the highest vapour density.
Answer: $\text{Cl}_2$
Hence, the correct answer is option: 'C'.