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Question

E0M2+(aq)/M(s)has a positive value for which of the following elements of 3d transition series?

A
Cu
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B
Zn
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C
Cr
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D
Co
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Solution

The correct option is A Cu
According to the electrochemical series, elements present above H have postive E0value.

Usually across the first transition series, the negative values for standard electrode potential decrease except for Mn and Zn due to stable d5 and d10-configuration.
For M2+(aq)/M(s),outofthegivenoption,Cu2+(aq)/Cu(s)willbetheanswer

Cu2+(aq)+2eCu(s);E0=+0.34 V
Zn2+(aq)+2eZn(s);E0=0.763 V
Co2+(aq)+2eCo(s);E0=0.28 V
Cr2+(aq)+2eCr(s);E0=0.9 V


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