Question

Use the data to answer the following and also justify giving reason
Cr Mn Fe Co
MZIM
-0-91 -1-18 – das 22
E3+, 1827 – 041 41357 101 410
(a) Which is a stronger reducing agent in aqueous medium,
Cr2+ or Fe2+ and why?
(b) Which is the most stable ion in 2 oxidation and why?​

Answer 1

Answer:

Cr2+ is a better reducing agent. As it attains a d3 configuration on loosing an electron while Fe2+ attains d5 configuration.

NOTE: In an aqueous medium d3 (half filled t2g orbital) is more stable than d5.

Mn2+ is the most stable form as it has half filled degenerate orbital.

Fe2+ has greater stability than Cr2+ through exchange energy.