Which of the following gases has the highest rate of diffusion at the same temperature and pressure?
- CH₄
- CO₂
- O₂
- NH₃
📝 Detailed explanation
According to Graham's law, rate is inversely proportional to the square root of molar mass.Molar masses: CH₄=16, CO₂=44, O₂=32, NH₃=17.
Methane (CH₄) is the lightest and diffuses fastest.