First slide
Types of redox reactions
Question

Consider the change in oxidation state of bromine corresponding to different emf values as shown in the given diagram :

Then the species undergoing disproportionation is

Difficult
Solution

For a reaction to be spontaneous, Eocell  should be positive.

HBrOBr2     E°=1.595 V,SRP( cathode )HBrOBrO3-  E°=-1.5 V,SOP( anode )2HBrOBr2+BrO3-

Ecell °= SRP (cathode) - SRP (anode) 

             =1.595-1.5 = 0.095V

Ecell °>0ΔG°<0 (spontaneous) 

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