The\[E_{{{M}^{3+}}/{{M}^{2+}}}^{o}\]values for\[Cr,Mn,Fe\]and\[Co\]are\[-0.41+1.57.+0.77\]and\[+1.97\text{ }V\]respectively. For which one of these metals the change in oxidation state from +2 to +3 is easiest?
A)\[Cr\]
B) \[Mn\]
C) \[Fe\]
D) \[Co\]
Correct Answer:
A
Solution :
More negative value ofindicates better reducing agent thus easily oxidised. Thus oxidation oftois the easiest.