The density of a gas 'X' is twice that of another gas 'Y'. If the molecular weight of gas 'Y' is 'M'; then the molecular weight of the gas 'X' will be________________?
Correct answer: C. 2M
- A. M
- B. M/2
- C. 2M
- D. M/4
Explanation
For gases at the same temperature and pressure, density is proportional to molecular weight because ρ = PM/RT. If gas X is twice as dense, its molecular weight is 2M.
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