The d-And-f-Block Elements

Short Answer Type

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Which is a stronger reducing agent Cr2+ or Fe2+ and why?

Cr2+ is strong reducing agent than Fe2+.
Reason: d4 → d5 occurs in case of Cr2+ to Cr3+.

But d6 → d5 occurs in case of Fe2+ to Fe3+. In a medium (like water) d3 is more stable as compared to d5.

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