Explain as to why the E Θ value for the Mn 3+ /Mn 2+ couple…

Chemistry D and F - Block Elements General Subjective Type

Published on: August 13, 2026

Explain as to why the E Θ value for the Mn 3+ /Mn 2+ couple is much more positive than that for Cr 3+ /Cr 2+ or Fe 3+ /Fe 2+ .

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Much larger third ionisation energy of Mn (change from 3d 5 to 3d 4 ) is responsible for this. This also explains why the +3 state of Mn is of little importance.

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