Use the data to answer the following and also justify giving reason :

                               Cr \; \; \; \;\; \; Mn\; \; \; \; \; \; \; Fe\; \; \; \; \; \; Co

E^{0}_{M^{2+}/M}\; \; \; -0.91\; \; \; -1.18\; \; \;\; -0.44\; \; \; -0.28

E^{0}_{M^{3+}/M}\; \; \; -0.41\; \; \; +1.57\; \; \;\; +0.77\; \; \; +1.97

(a) Which is a stronger reducing agent in aqueous medium,Cr^{2+} or Fe^{2+}and why ?

(b) Which is the most stable ion in+2 oxidation and why ?

 

 

 

 
 
 
 
 

Answers (1)
S Sumit

(a) Cr^{2+} because lower the E^{0} value, more is the tendency of metal to get oxidised and hence stronger reducing agent.

(b) Mn^{+2} is most stable ion due to presence half filled extra stable d^{5} configuration.

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