In a galvanic cell, chemical energy of a redox reaction is converted into electrical
energy, whereas in an electrolytic cell the redox reaction occurs on passing electricity.
The simplest galvanic cell is in which Zn rod is placed in a solution of ZnSO4 and Cu
rod is placed in a solution of CuSO4. The two rods are connected by a metallic wire
through a voltmeter. The two solutions are joined by a salt bridge. The difference
between the two electrode potentials of the two electrodes is known as electromotive
force. In the process of electrolysis, the decomposition of a substance takes place by
passing an electric current. One mole of electric charge when passed through a cell will
discharge half a mole of a divalent metal ion such as Cu2+. This was first formulated by
Faraday in the form of laws of electrolysis.
Answer the following questions: