MCQ practice · SSC Chemistry Board questions · Chapter 2: States of Matter
Which two have equal diffusion rates?
Think it through first, then pick an option.
- a CH₄, NH₃
- b C₂H₄, CO
- c C₂H₆, SO₂
- d NO, N₂
Answer and explanation
Correct answer: b C₂H₄, CO
C₂H₄ = 12 × 2 + 4 = 28 and CO = 12 + 16 = 28; equal masses give equal rates.
Why the other options are wrong
- a CH₄, NH₃: CH₄ is 16 and NH₃ is 17; different masses, different rates.
- c C₂H₆, SO₂: C₂H₆ is 30 and SO₂ is 64; the masses are far apart.
- d NO, N₂: NO = 14 + 16 = 30 and N₂ = 28; the masses differ.
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