Q.

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

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answer is 4.

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Detailed Solution

For a reaction to be spontaneous, Eocell should be positive.HBrO⟶Br2 E°=1.595 V,SRP( cathode )HBrO⟶BrO3- E°=-1.5 V,SOP( anode )2HBrO⟶Br2+BrO3-Ecell °= SRP (cathode) - SRP (anode) =1.595-1.5 = 0.095VEcell °>0⇒ΔG°<0 (spontaneous)

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