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?

Answer 1

a) Gas collected at cathode is hydrogen and at anode is oxygen.

b) In water (H2O), hydrogen atoms are double of oxygen atoms...so ratio of hydrogen : oxygen produced is 2:1.

c) Pure water is a non conductor of electricity and dilute acid is added to form ions which conducts electricity. Hence, Dil H2SO4 is added to increase conductivity. If it is not added, water will not conduct electricity and Gases will not evolve.

Answer 2

Answer:

In electrolysis of water :

a ) . Hydrogen gas collected at cathode. And oxygen gas gas collect at anode.

b ) . We know that in water there is 2 hydrogen atom and 1 oxygen atom. That's why volume of gas collected at one electrode double than the other.

c ) . Pure water is a bad conductor of electricity when we add drops of dil sulphuric acid we make it a good conductor of electricity.