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# 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.

When electric current is passed through water it decomposes to release $$H_2 and O_2$$ gas , so gas collected in one of the test tubes is double of the amount collected in the other tube.Here, after electrolysis two molecules of Hydrogen and one molecule of Oxygen gas is released, hence the amount of Hydrogen collected would be double than that of Oxygen.