State the observations at the anode & at the cathode during the electrolysis of –

(i) Fused lead bromide using graphite electrodes.

(ii) Copper sulphate solution using copper electrodes.

Identify the substance underlined, in each of the following —

(i) The electrolyte used for electroplating an article with silver.

(ii) The particles present in a liquid such as kerosene, that is a non-electrolyte.

State one relevant observation : At the anode when molten lead bromide is electrolysed using graphite electrodes

Choose the correct answer from the options given : The electrolysis of acidified water is an example of :

1. Reduction
2. Oxidation
3. Redox reaction
4. Synthesis