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  4. In 3 d series, the metal having the highest M 2+ / M standard electrode potential is

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Q. In $3 d$ series, the metal having the highest $M ^{2+} / M$ standard electrode potential is

JEE MainJEE Main 2022Electrochemistry

Solution:

$ Cr ^{+2} / Cr \rightarrow-0.90 \,V $
$ Fe ^{+2} / Fe \rightarrow-0.44 \,V $
$Cu ^{+2} / Cu \rightarrow+0.34 \,V $
$ Zn ^{+2} / Zn \rightarrow-0.76 \,V$
So Ans. $Cu ^{+2} / Cu$