Question

The following are some statements about electrolysis:
I) involves flow of electrons from anode to cathode
II) Involves no chemical reaction at electrodes
III) Oxidation occurs at anode and reduction at cathode
IV) Anions migrate towards cathode
A.Only I and III are correct
B.Only I and II are correct
C.Only I, II and III are correct
D.All are correct

Answer 1

Hint: To answer this question, you must be familiar with the concept of electrolysis. We know that electrolysis is the breaking down of an electrolyte due to the supply of electricity.

Complete step by step solution:
In electrolysis we need to supply external energy to carry out a chemical reaction which is non spontaneous in nature otherwise. The second law of Faraday states that when the same amount of energy is passed through the electrolytic solution of a number of substances then and the equivalent weight of electrolyte in each solution will be in a ratio to each other.
During electrolysis, the cathode is negatively charged while the anode is positively charged. In the circuit, the electrons flow in the opposite direction to that of the current. Thus, electrons move from the anode to the cathode. Statement I is correct.
During electrolysis, electricity is passed through the cell causing a chemical change. Thus, statement II is wrong.
In any type of cell, whether electrochemical or electrolytic, oxidation takes place at the anode while the cathode is the site for reduction. Statement III is correct.
During electrolysis, anions move towards the positively charged anode and cations move towards the negatively charged cathode. Statement IV is correct.

Thus, the correct answer is A.

Note:
In an electrochemical cell, the chemical energy of a spontaneous redox reaction is converted into electrical energy and in an electrolytic cell, electrical energy is used to carry out a non-spontaneous redox reaction. An electrochemical cell can be made to act as an electrolytic cell if a potential difference greater than the potential of the electrochemical cell is applied. In this case, the reaction begins to proceed in the opposite direction, that is, the non-spontaneous reaction takes place like in an electrolytic cell.