Four successive members of the first row of transition elements are listed below with atomic numbers. Which one of them is expected to have the highest E M 3 + / M 2 + o value?

Step-by-step solution

Species having the highest reduction potential i.e., tendency to undergo reduction by gain of electron. SRP value increases from left to right in the period for the d-block elements. M 3 + ( a q )   + 1 e − →   M 2 + ( a q ) 2 6 Fe 3 + / Fe 2 + ⇒ 4 s 0 3 d 5 → 4 s 0 3 d 6 + 0 . 7 7  volt 2 7 Co 3 + / Co 2 + ⇒ 4 s 0 3 d 6 → 4 s 0 3 d 7 + 1 . 9 7  volt 2 4 Cr 3 + / Cr 2 + 4 s 0 3 d 3 → 4 s 0 3 d 4 - 0 . 4  volt 2 5 Mn 3 + / Mn 2 + 4 s 0 3 d 4 &#8594