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Question:

The standard electrode potentials (EoM+/M) of four metals A, B, C, and D are -1.2 V, 0.6 V, 0.85 V, and -0.76 V, respectively. The increasing sequence of deposition of metals on applying potential is:

B, D, C, A

A, C, B, D

C, B, D, A

D, A, B, C

Solution:

The standard electrode potentials (EoM+/M) of four metals A, B, C, and D are -1.2 V, 0.6 V, 0.85 V, and -0.76 V respectively. The increasing sequence of deposition of metals on applying potential is C, B, D, A. C is having the maximum standard reduction potential of 0.85 V and A is having the minimum standard reduction potential of -1.2 V. Therefore, the increasing sequence of deposition of metals on applying potential is equal to the decreasing sequence of the standard reduction potentials.