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 is hydrolyzed to release H₂ and O₂ gas in activity 1.7, the amount of gas collected in one test tube 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 collected as there will be oxygen.