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The reduction reaction at cathode in a Leclanche primary cell is

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a

Zn2++4NH3→Zn(NH3)42+

b

H2(g)+2MnO2(s)→2MnO(OH)(s)

c

Zn(s)→Zn(aq)2++2e−1

d

MnO2+NH4+1+1e−1→MnO(OH)+NH3

answer is D.

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Detailed Solution

MnO2+NH4+1+1e−1→MnO(OH)+NH3(a) is not redox (b) though it is reduction, this is not the main reduction reaction. Reduction of ammonium ion into Ammonia is the main reduction reaction in a Leclanche cell. (c) is Oxidation and not reduction

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