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ECAT Chemistry QUESTION #800
Question 1
The order of rate of diffusion is:
  • \(\text{SO}_2 > \text{CO}_2 > \text{Br}_2 > \text{NH}_3\)
  • \(\text{Br}_2 < \text{SO}_2 < \text{CO}_2 < \text{NH}_3\)✔️
  • \(\text{Br}_2 > \text{SO}_2 > \text{CO}_2 > \text{NH}_3\)
  • \(\text{SO}_2 < \text{CO}_2 < \text{Br}_2 < \text{NH}_3\)
Correct Answer Explanation
By Graham's law, rate of diffusion \(\propto \dfrac{1}{\sqrt{M}}\). Molar masses: \(\text{NH}_3=17 < \text{CO}_2=44 < \text{SO}_2=64 < \text{Br}_2=160\). So \(\text{Br}_2 < \text{SO}_2 < \text{CO}_2 < \text{NH}_3\).