question_answer

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.