CBSE Class 10 Science 2020 · Paper 31/4/2 · Question 15(b)

(a) Electrolysis of water (electrolytic decomposition of water). (b) Both the anode and the cathode are carbon electrodes (graphite rods). (c) $2{\text{H}}_2\text{O}(\text{l})\stackrel{\text{electric current}}{\to }2{\text{H}}_2(\text{g})+{\text{O}}_2(\text{g})$ (d) Pure water is a very poor conductor of electricity; the dilute sulphuric acid supplies ions that carry the current through the water, so the water can be decomposed.