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

Because water gets hydrolyzed to produce H₂ and O₂ gas in activity 1.7, the amount of gas collected in one of the test tubes is double that of the other. Here, two molecules of hydrogen and one molecule of oxygen are released as a result of electrolysis; as a result, there will be twice as much hydrogen gathered as there will be oxygen.