What is the practical application of the electrolysis of copper sulphate solution? Briefly, describe one such application?

State one relevant observation for of the following:

At the anode, when molten lead bromide is electrolyzed using graphite electrodes.

State one relevant reason for the following:

• Graphite anode is preferred to platinum in the electrolysis of molten lead bromide.

Will the bulb in the following circuits glow? Justify your answer.

What do you understand by a closed electric circuit?

Will the bulb in the following circuits glow? Justify your answer.

Figures below show a cell connected to a bulb through insulated copper wires. State with the reason in which case will the bulb (i) glow, and (ii) not glow.