State relevant observations for the following:
When copper sulphate solution is electrolyzed by using a platinum electrode.

State one relevant observation for the following: At the anode, when molten lead bromide is electrolyzed using graphite electrodes.

State one relevant observation for each of the following: At the Anode when aqueous copper sulphate solution is electrolysed using copper electrodes.

State one observation for the following : A zinc granule is added to copper sulphate solution.

Give reason : The blue colour of aqueous copper sulphate fades when it is electrolysed using platinum electrodes.

State one relevant observation for the following: Platinum is added to aqua-regia.

State one relevant observation for the following: When hydrogen sulphide gas is passed through lead acetate solution.

State one relevant observation Water is added to anhydrous copper sulphate.

State one observation: A zinc granule is added to copper sulphate solution.

State one relevant observation for each of the following reactions : Copper carbonate is decomposed on heating.

State one relevant observation for the following : Lead nitrate solution is treated with sodium hydroxide solution drop wise till it is in excess