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  4. Four successive members of the first row transition elements listed below with atomic numbers. Which one of them is expected to have the highest Em3+/m2+° value?

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Q. Four successive members of the first row transition elements listed below with atomic numbers. Which one of them is expected to have the highest $E_{m{^{3+}}/m{^{2+}}}^{\circ}$ value?

JEE MainJEE Main 2013The d-and f-Block Elements

Solution:

SRP value normally increases from left to right in the period of $d$-block elements. Some SRP value are exceptionally higher due to stability of product ion. e.g.
$E^{\circ} _{ Mn ^{3+}/ Mn ^{2+}} =+1.57 \,V ; E_{ Co ^{3+} / Co ^{2+}}^{\circ}=+1.97 \,V$
Thus, $E_{M^{3+} / M^{2+}}^{\circ}$ is highest for $Co$.