When an electric current is passed through a copper sulphate solution, then copper sulphate dissociates into
A. Copper ion and sulphuric acid
B. Copper ion and sulphate ion
C. Cuprous oxide and sulphur ion
D. Cuprous oxide and sulphur dioxide

Hint: A chemical reaction occurs when an electric current is passed through a conducting solution which results in the formation of bubbles on the electrodes. The metal gets deposited on the electrode and changes in the colour of the solution can be seen.

Complete step by step answer:
In a copper sulphate solution, we see that when an electric current is passed it dissociates into copper and sulphate ions. The copper gets deposited on the electrode which is connected to the negative terminal of the battery. From other electrodes, equal amounts of copper are dissolved in the solution. Hence, the loss of copper is restored from the solution and the process still continues. The transfer of copper takes place from one electrode to another electrode.
When an electric current is passed through copper solution, the copper sulphate dissociates to give copper ion and sulphate ion.

So, the correct answer is Option B.

Additional information:
Electroplating has many useful applications. It is used in the industry for coating metal objects with a thin layer of metal that has some of the properties that the metal of an object lacks. Chromium plating is used in many household objects like bath taps, kitchen gas burners.

Note: In the conclusion, When electric current is passed copper sulphate dissociates to give ions. In $1800$, William Nicholson, a British chemist has shown that when electrodes are immersed in water, current was passed that results in the formation of bubbles of oxygen and hydrogen in which oxygen bubbles are formed on the electrode that is connected to positive terminal of the battery whereas the hydrogen bubbles are formed on the electrode that is connected to negative terminal of the battery.
Electroplating is defined as a process in which the depositing layer of any desired metal on another material is done through electricity.