The electrode potential of $M^{2 +} / M$ of 3d-series elements shows positive value for:

C o

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C u

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Z n

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F e

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Solution

The correct option is B $C u$
Only copper shows positive value for electrode potential of $M^{2 +} / M$ of 3d-series elements.
$E_{C u^{2 +} / C u}^{0} = + 0.34 V$
The rest of the metals are good oxidizing agents with $E^{0} < 0$ .

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