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How the reduction potential of an electrode can be decreased?

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How the reduction potential of an electrode can be decreased? Select the correct answer from above options

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It can be decreased either by decreasing metal ion concentration, i.e.,[Mn+] or by decreasing temperature T. Mn++ne-→M EMn+/M=E c- Mn+/M - RT nF ln(1) [Mn+] =E c- Mn+/M + RT nF ln[Mn+]

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