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Two non-reactive monatomic ideal gases have their atomic masses in the ratio 2:3. The ratio of their partial pressures, when enclosed in a vessel kept at a constant temperature, is 4:3. The ratio of their densities is

1. 1:4
2. 1:2
3. 6:9
4. 8:9

Correct answer: 8:9

Solution

Using the ideal gas law and the given pressure ratio, the density ratio is derived as (P₁M₁) / (P₂M₂). Substituting the values, the ratio is 8:9.

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