Electroplating is the process of depositing a layer of any desired metal on another metal by means of electricity.
Advantages of electroplating:
(i) It is used to coat a desired metal on another metal.
(ii) It protects the metals from corrosion.
(iii)It also prevents the metallic surface from rusting.
(iv) Some cheap and dull metals are coated with costly and shinning metals for ornamental use.
(v) It can make more reactive metals like iron less reactive.
(vi) Coating of chromium on metals gives luster to object

(a) If Ram touched the heated electric bulb, then his hands could get a serious burn and he would not be able to perform the experiment again with the same desire.
(b) Since aluminium is a good conductor of electricity and mostly, it has been seen that aluminium wires are used for performing the experiment instead of wires without having PVC coating on them.
(c) Ram's teacher has a great concern towards Ram, so that he can perform the experiment carefully and can get its fruitful conclusion

(a) The deflection in the magnetic compass shows that the current is flowing in the circuit.
(b) The bulb did not glow, it may be because of the current passing through the circuit could be weak. Also, it may happen because of other reasons like due to bulb fused or the connections may be loose.
(c) Increase in the number of turns in the coil wound around the magnetic compass would increase the magnetic field around the magnetic compass which will result in the flowing of large amount of current through the circuit.

We take CuS04 solution and dip a pure copper plate as cathode (-ve) and impure copper plate as anode (+ve). Due to voltage of battery, the impurities from the impure sample slowly deposit at the bottom and the copper plate becomes purified .

Take a few plastics or rubber caps of bottles. Put one teaspoon of lemon juice or vinegar in one cap. Now, bring the tester over the cap and let the ends of the tester dip into lemon juice or vinegar. So, we see that bulb starts to glow. It indicates that lemon juice and vinegar are good conductors of electricity.

Take the tray from the inside of a discarded matchbox. Wrap an electric wire a few times around the tray. Place a small compass needle inside it. Now connect one free end of the wire to the one terminal of a battery. Leave the other end free.
Take another piece of wire and connect it to the other terminal of the battery. Join the free ends of two wires momentarily. The compass needle should show deflection. Your tester with two free ends of the wire is ready.

Copper will not be deposited on the carbon rod because carbon rod is a poor conductor of electricity. For electroplating, the circuit must be completed and that can be completed only by using the conducting material. Instead of carbon rod, it should be any metal, then only it can be electroplated.

The following methods are used to test the conduction:
(i)The conductivity of substance can be checked by using electric bulb. When the liquid between the two ends of the tester allows the electric current to pass, the circuit of the tester becomes complete. The current flows in the circuit and the bulb glows. If the circuit of tester is not complete the bulb does not glow. This method does not work when current is very small.

(ii) We can use another effect of electric current to test the conduction. A magnetic tester is also used to test conductivity. When current is allowed to pass through it, it creates a magnetic field and the compass shows that the current is passing through circuit