Question

Which ore is stronger reducing agent Cr2+ or Fe2+ ? explain

Answer 1

Actually, Cr2+ is a stronger reducing agent, as on oxidation it becomes Cr3+. In Cr3+, three electrons are present in the eg level (Crystal field splitting due to water ligands). Hence, the eg level is half-filled, Cr3+ is extremely stable. But for Fe2+ to Fe3+ the change is to a lesser stable d5 configuration.

Answer 2

Answer:

Explanation: Cr2+ is stronger R.A than Fe2+ thus can be explained on the basis of standard electrode potential values E(Cr3+/Cr2+ = -0.41 V )

And E(Fe3+/Fe2+ = 0.77 V ) Thus Cr2+ is easily oxidized to Cr3+ but Fe2+ is not easily oxidised to Fe3+