Question

in the process of purification of copper metal a thin plate of pure copper and thick rod of impure copper is used as electrode and metal salt solution is used as electrolyte A which electrode is connected to positive of the battery B​

Answer 1

Answer:(a) Thick rod of impure copper is connected to the positive terminal of the battery.

(b) Thin plate of pure copper is connected to the negative terminal of the battery.

(c) Copper sulphate solution is taken as electrolyte.

Explanation:

Answer 2

Answer:

The thick rod of impure copper plate is to be attached to the positive terminal of the battery because when electric current is passed through the copper sulphate solution, it gets dissociated into copper and sulphate. The free copper, being positively charged, gets drawn to the negative terminal of the battery and gets deposited on it. On the other hand the loss of copper from the solution is regained from the impure copper rod which is attached to the positive terminal of the battery.