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Q.

A molten solution contains Fe2+, Ag+, Bi3+ and Pb2+ ions in same concentration. The value of redox potential are-Ag+/Ag = 0.8 V, Fe3+/Fe = –0.44 V, Bi3+ / Bi = +0.21, Pb2+ / Pb = –0.13 V. If sufficient voltage is applied to deposit metal then sequence of deposition will be

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a

Ag, Bi, Pb, Fe

b

Fe, Pb, Bi, Ag

c

Bi, Pb, Ag, Fe

d

Pb, Ag, Bi, Fe

answer is A.

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Detailed Solution

Lower reduction potential displaces higher reduction potential 

Sequence of deposition is Ag,Bi,Pb

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A molten solution contains Fe2+, Ag+, Bi3+ and Pb2+ ions in same concentration. The value of redox potential are-Ag+/Ag = 0.8 V, Fe3+/Fe = –0.44 V, Bi3+ / Bi = +0.21, Pb2+ / Pb = –0.13 V. If sufficient voltage is applied to deposit metal then sequence of deposition will be