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 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 electic 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:

(a) What is the function of a salt bridge in a galvanic cell?
(b) When does galvanic cell behave like an electrolytic cell?
(c) Can copper sulphate solution be stored in a pot made of zinc? Explain with the help of the value of E^o cell

(E^oCu²⁺/Cu=0.34 V)
(E_oZn²⁺/Zn=-0.76 V)

OR

(c) How much charge in terms of faraday is required for the following:

(i) 1 mol of MnO₄^- to Mn²⁺
(ii) 1 mol of H₂O to O₂

Solution

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