Multiple choice

The ratio of masses of oxygen and nitrogen in a particular gaseous mixture is $ 1:4$. The ratio of number of their molecules is :

  1. $ 1:8$
  2. $ 3:16$
  3. $ 1:4$
  4. $ 7:32$
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D Correct answer
Explanation

Number of molecules = mass / molar mass. For oxygen (O2, molar mass 32), n1 = (1/32). For nitrogen (N2, molar mass 28), n2 = (4/28) = (1/7). The ratio n1 : n2 = (1/32) : (1/7) = 7 : 32.

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