Multiple choice

A $20.0 cm^{2}$ mixture of $CO, CH_{4}$ and He gases is exploded by an electric discharge at room temperature with excess of oxygen. The volume contraction is found to be $13.0cm^{3}$. A further contraction of $14.0 cm^{3}$ occurs when the residual gas is treated with KOH solution. Find out the volume percentage of CO in gaseous mixture.

  1. 25%

  2. 50%

  3. 20%

  4. 37.5%
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D Correct answer

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