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From a heated mixture of nitrogen, oxygen and carbon, two compounds (out of the many obtained) are isolated. The rates of diffusion of the two isolated compounds are almost identical. The two compounds are

1. N2O and CO2
2. CO and NO
3. CO2 and NO2
4. N2O and CO

Correct answer: CO and NO

Solution

The rates of diffusion of gases are inversely proportional to the square root of their molar masses (Graham's law). CO (molar mass = 28 g/mol) and NO (molar mass = 30 g/mol) have nearly identical molar masses, leading to similar diffusion rates.

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