1.

Between Cr2+ and Fe2+ which is a stronger reducing agent in aqueous solution and why.

Answer»

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

Cr2+ ----> Cr3+ Fe2+ -----> Fe3+  

The E0 Cr3+/Cr2+ value is - 0.41 V and E0Fe3+/Fe2+ 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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