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Why is the amount of gas collected in on...

Why is the amount of gas collected in one of the test tubes in Activity 1.7 double of the amount collected in the other? Name this gas.

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On electrolysis, water decomposes according to the reaction,
`2H_(2)O_((l))overset("On passing electric current")to2H_(2(g))+O_(2(g))`
Thus, water decomposes to give hydrogen and oxygen in the ratio 2 : 1 by volume. Hence, the volume of hydrogen collected will be twice the volume of oxygen collected.
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A group of students carried out electrolysis of acidified water in the laboratory. By the end of the experiment two gases were collected in the test tubes at both the electrodes. The gas collected in one test tube is double the volume of gas collected in the other. Name this gas. Give reason for your answer.

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