Question

In electrolysis of water which gas is collected at anode and cathodea) gas is collected at the cathode and gas is at anode. (1) (b) the gas which is collected in double the amount in the electrolysis of water experiment is hydrogen. This is because contains 2 parts of hydrogen element and 1 part of oxygen element by volume.

Answer 1

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.

Answer 2

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