Question

Assertion: In an electrochemical cell, the electrode that is the site of reduction is called anode.
Reason: Oxidation always occurs at the cathode.
A.Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
B.Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
C.Assertion is correct but Reason is incorrect.
D.Both Assertion and Reason are incorrect.

Answer 1

This question gives the knowledge about the electrochemical cell. Electrochemical cell is defined as the cell which converts the chemical energy into electrical energy. This means electrochemical cells utilize various chemical reactions to produce electrical energy.

Complete step-by-step answer: Electrochemical cells are the devices which use various chemical reactions taking place in it to produce electrical energy. It generally produces electrical energy from chemical energy. Electrochemical cells are also known as voltaic cells or Galvanic cells. Electrochemical cell is the reverse of an electrolytic cell because in an electrochemical cell, chemical energy changes to electrical energy and in an electrolytic cell, electrical energy changes to chemical energy.
Generally two types of reactions take place in electrochemical cell which are as follows:
Oxidation reactions: In these types of reactions oxidation takes place. Oxidation is defined as the reactions resulting in loss of electrons. Oxidation reactions generally occur at anode. It is denoted by a negative sign. Electrons generally move away from anode. Oxidation is also defined as loss of hydrogen.
Reduction reactions: In these types of reactions reduction takes place. Reduction is defined as the reactions resulting in gain of electrons. Reduction reactions generally occur at cathode. It is denoted by a positive sign. Electrons generally move towards cathode. Reduction is also defined as gain of hydrogen.
Therefore, from the above explanation we conclude that both the assertion and reason are incorrect.

Hence, option $D$ is correct.

Note: Oxidation is defined as the reactions resulting in loss of electrons and the oxidation reactions generally take place at anode. Reduction is defined as the reactions resulting in gain of electrons and the reduction reactions generally take place at cathode.