Question

1 A compound `X` is used for drinking, has pH =7.Its acidified solution undergoes decomposition in presence of electricity to produce gases `Y` and `Z` The volume of Y is double than Z. Y is highly combustible whereas Z is supporter of combustion .Identify X, Y & Z and write the chemical reactions involved ?

Answer 1

The substance X is water[chemical formula H20].Water is a neutral substance whose pH is 7.when electricity is passed through water containing a few drops of sulphuric acid, it decomposes to give its constituent elements as products i.e.hydrogen and oxygen.Following is the chemical equation for electrolysis of water. 
2H2O electricity gives rises to 2H2[g]+O2[g]