Question

The process used in purifying metals by electrolysis is called:
A. Electroplating
B. Electrometallurgy
C. Electrorefining
D. Electrodeposition

Answer 1

Hint: We know that electrolysis is the process in which elements from their ionic compounds are decomposed by using direct current . The cations get reduced in the cathodes and the anions get oxidised in the anodes. Cathodes are negative electrodes and the anodes are positively charged electrodes.

Complete step by step answer:
As we know that metals can be purified by many processes. It is very important to remove the unwanted minerals and purify the metal. Electroplating is the process by which a metal coating is applied on solid substrates by using a direct electric current. Electroplating is done to prevent a metal from corrosion and getting damaged. Some of the examples of electroplating are silver plating, copper plating and chromium plating.
Electrometallurgy is the process in which metals are produced by electrolysis with the help of electrical energy. Electrodeposition is the process in which solid materials are deposited in a given solution.
Electrorefining is the process in which metals are purified with the help of electrolysis. With the help of electrorefining we can increase the purity of an impure metal which has been extracted from the ore. The positive electrode known as the anode is impure metal that has to be purified.
So, from the above explanation it clear to us that

The correct answer of the given question is option: C. electrorefining.

Note:
Always remember that electrorefining is the process in which we can purify metals with the help of electrolysis. Copper, Nickel and Tin are some of the examples of the metals which can be purified by the process of electrorefining.