Question

In electrochemical cell, oxidation and reduction occurs at:
A. Anode and cathode respectively
B. Cathode and anode respectively
C. Electrode
D. Anode only

Answer 1

Hint: First of all, understand the question carefully. In electrochemical cells, oxidation and reduction takes place in chemical reactions. Anode and cathode also can be defined through oxidation and reduction.

Complete step by step answer: An electrochemical cell consists of two conductive electrodes. One is anode and the other is cathode. An electrochemical cell is a device which produces electrical energy from chemical reactions or by using electrical energy it can cause chemical reactions. Oxidation takes place at the electrode named anode whereas reduction takes place at the electrode named cathode. So, A is the correct option and remaining options are wrong. In this process, electrons flow from one chemical substance to another substance. Redox reaction which is also called oxidation – reduction reaction takes place in electrochemical cells.

Additional information: There are types of electrochemical cells. One is a galvanic or voltaic cell and the other is an electrolytic cell. The main difference between galvanic cell and electrolytic cell is the energy for galvanic cell is derived through spontaneous redox reaction whereas electrolytic cell involves non – spontaneous reaction and it involves an external electrons source.
Applications of electrochemical cells:
-Standard 1.5 volt cells which are used to power TV and AC remotes, clocks, cameras etc.
-Lithium batteries in digital cameras.
-Silver oxide batteries in hearing aids.
-Batteries used in torches etc.

Note: Electrochemical cell process takes an important role in our daily life. It is clear that oxidation takes place at anode and reduction takes place at cathode from the above given information. Oxidation is the loss of electrons whereas reduction is the gain of electrons.