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Four successive members of the first row...

Four successive members of the first row transition elements are listed below with atomic numbers. Which one of them is expected to have the highest `E_(M^(3+)//M^(2+))^(0)` value

A

`Cr(Z = 24) `

B

`Mn(Z = 25)`

C

`Fe(Z = 36)`

D

`Co( Z = 27)`

Text Solution

Verified by Experts

The correct Answer is:
D
`E_(Cr^(3+)//Cr^(2+))^0 = -0.41V, E_(Mn^(3+)//M^(2+))^0 = + 1.57V,`
`E_(Fe^(3+)//Fe^(2+))^0 = + 0.77, E_(Co^(3+)//Co^(2+))^0 = + 1.97 V` SRP value
normally increases from left to right in the period of dblock elements. Some SRP value are exceptionally higher due to stability of product ion. For e.g.
`E_(Mn^(3+)//Mn^(2+))^0 = + 1.57 V, E_(Co^(3+)//Co^(2+))^0 = + 1.97V`.
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