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A 20 ml mixture of CO,CH4, and Helium (H...

A 20 ml mixture of `CO,CH_4`, and Helium (He) gases is exploded by an electric discharge at room temperature with excess of oxygen.the volume contraction is found to be 13 ml. A further contraction of 14 ml occurs when the residual gas is treated with KOH solution. Find out the composition of the gaseous mixture in terms of volume percentage.

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