ElectrochemistryHard

Question

A student made the following observations in the laboratory:

(I) Clean copper metal did not react with 1 M – Pb(NO3)2 solution.

(II) Clean lead metal dissolves in 1 M – AgNO3 solution and crystals of Ag metal appeared.

(III) Clean silver metal did not react with 1 M – Cu(NO3)2 solution.

The order of decreasing reducing character of the three metals is

Options

A.Cu > Pb > Ag
B.Cu > Ag > Pb
C.Pb > Cu > Ag
D.Pb > Ag > Cu

Solution

(I) Cu cannot reduce Pb

(II) Pb can reduce Ag

(III) Ag cannot reduce Cu.

Hence, reducing power: Pb > Cu > Ag

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