Question

In the electrolysis of water,

(a) Name the gas collected at anode and cathode

(b) Why is the volume of gas collected at one electrode double than the other?

(c) What would happen if dil H2SO4 is not added to water? (3)

Answer 1

(a) Anode : Oxygen
Cathode : Hydrogen

(b) The volume of gas collected at cathode is double than that of the Anode because water has two molecules of hydrogen whereas only one molecule of oxygen so hydrogen is double..

(c) If dil. H2SO4 is not added to water then it won't conduct electricity hence, no electrolysis would occur....because H2SO4 provides an acidic I.e ., conducting solution...



Thank You !

Answer 2

(a) The gas collected at anode is oxygen and the gas collected at cathode is hydrogen.

(b) At cathode the volume is double because in each molecule of water there are 2 atoms of hydrogen and 1 atom of oxygen. Thus, volume of hydrogen is double that of oxygen.

(c) H2SO4 is added so that solution becomes good conductor of electricity.