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Question:

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

Answer:

The following reactions are involved when Cr2+ and Fe2+ act as reducing agents.

Cr2+  Cr3+ Fe2+  Fe3+

The  value is - 0.41 V and  is +0.77 V. This means that Cr2+ can be easily oxidized to Cr3+, but Fe2+ does not get oxidized to Fe3+ easily. Therefore, Cr2+ is a better reducing agent that Fe3+.


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