Question

In the electrolysis of water
Name the gas collected and the cathode and anode why is a the volume of gas collected at one electrode doble at other?

Why is a few drops of oil H, s04 added to the water​

Answer 1

Hydrogen gas is collected at anode and Oxygen gas is collected at cathode.

Water is not a good conductor of electricity H2 S o4 is an acid so to make water a good conductor H2 S o4 is added to water

Answer 2

When electric current is passed through water , it decomposes to give hydrogen gas and oxygen gas.

                 ELECTRICITY

2H₂O(I) ---------------------------- > 2H₂(g) + O₂(g)

At cathode :

H+ ions will gain electrons and form Hydrogen gas 

2H⁺ +2e--->H2 (g)

At anode : Oxygen gas will be released 

4 OH⁻(aq)→O2(g) + 2 H2O(l) + 4 e−

II) The volume of hydrogen gas collected at cathode is more than volume of oxygen gas at anode because water is made up of 2 parts of hydrogen and 1 part of oxygen by volume.

iii) If dil.H2SO4 is added to water then the rate of electrolysis increases.