1.

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

Answer»

`Cr(Z=24)`
`Mn(Z=25)`
`Fe(Z=26)`
`Co(Z=27)`

Solution :`E_(Cr^(3+)//Cr^(2+))^(@)=-0.41V,E_(Mn^(3+)//Mn^(2+))^(@)=+1.57V`,
`E_(Fe^(3+)//Fe^(2+))^(@)=+0.77V, E_(Co^(3+)//Co^(2+))^(@)=+1.97VSRP` VALUE normally increases from left to right in the period of d-block ELEMENTS. Some SRP vlaue are EXCEPTIONALLY higher due to stability of PRODUCT ion. For e.g. `E_(Mn^(3+)//Mn^(2+))^(@)=+1.57V, E_(Co^(3+)//Co^(2+))^(@)=+1.97V`.


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