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Which statement(s) about Cr(2+) and Mn(3+) is/are correct? (Atomic numbers: Cr = 24, Mn = 25)

1. Only Cr2+ is a reducing agent
2. Cr2+ is a reducing agent, Mn3+ is an oxidising agent, both are d4, and Cr2+ on acting as reductant becomes d3
3. Both Cr2+ and Mn3+ are reducing agents
4. Mn3+ is a reducing agent and Cr2+ is an oxidising agent

Correct answer: Cr2+ is a reducing agent, Mn3+ is an oxidising agent, both are d4, and Cr2+ on acting as reductant becomes d3

Solution

Cr2+ (d4) is a reducing agent because Cr3+ (d3, stable t2g³) forms; Mn3+ (d4) is an oxidising agent because reduction to Mn2+ gives stable d5. Both ions are d4.

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