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Match List-I with List-II : List-I (a) Cd(s) + 2Ni(OH)3(s) → CdO(s) + 2NiO(OH)2(s) + H2O(l) (b) Zn(Hg) + HgO(s) → ZnO(s) + Hg(l) (c) 2PbSO4(s) + 2H2O(l) → Pb(s) + PbO2(s) + 2H2SO4(aq) (d) 2H2(g) + O2(g) → 2H2O(l) List-II (I) Primary battery (II) Discharging of secondary battery (III) Fuel cell (IV) Charging of secondary battery Choose the correct answer from the options given below:

1. (a)-(I), (b)-(II), (c)-(III), (d)-(IV)
2. (a)-(IV), (b)-(I), (c)-(II), (d)-(III)
3. (a)-(II), (b)-(I), (c)-(IV), (d)-(III)
4. (a)-(II), (b)-(I), (c)-(III), (d)-(IV)

Correct answer: (a)-(II), (b)-(I), (c)-(IV), (d)-(III)

Solution

The correct option matches the reactions with their respective processes: (a) represents the discharging of a secondary battery, (b) is a primary battery reaction, (c) involves the charging of a secondary battery, and (d) describes a fuel cell reaction.

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