Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 12
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How would you account for the following: Of the d4species, Cr2+ is strongly reducing while manganese(III) is strongly oxidising. - Chemistry

How would you account for the following:

Of the d4species, Cr2+ is strongly reducing while manganese(III) is strongly oxidising.

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Solution

Cr2+ is strongly reducing in nature. It has a d4 configuration. While acting as a reducing agent, it gets oxidized to Cr3+ (electronic configuration, d3). This d3 configuration can be written as `t_(2g)^3` configuration, which is a more stable configuration. In the case of Mn3+ (d4), it acts as an oxidizing agent and gets reduced to Mn2+ (d5). This has an exactly half-filled d-orbital and is highly stable.

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APPEARS IN

NCERT Class 12 Chemistry Textbook
Chapter 8 The d-block and f-block Elements
Q 21.1 | Page 235
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