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JEE Main 2014

JEE Main 2014 Chemistry question on Some Basic Concepts of Chemistry

The ratio mass of oxygen and nitrogen of a particular gaseous mixture is 1 : 4. The ratio of number of their molecules is
  1. A.
    1 : 4
  2. B.
    7 : 32
  3. C.
    1 : 8
  4. D.
    3 : 16
Show answer and solution

Correct option: B

Solution

Mass ratio O₂ : N₂ = 1 : 4.

Moles of O₂ = 1/32, moles of N₂ = 4/28 = 1/7.

Ratio of molecules = (1/32) : (1/7) = 7 : 32.

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