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 [2018]

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Solution

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 [2018]

1 ${BrO}_{3}^{-}$

2 ${BrO}_{4}^{-}$

3 ${Br}_{2}$

4 $HBrO$

Ans.
(4)

For a reaction to be spontaneous, $E_{cell}^{\circ}$ should be positive as $Δ G ° = - n F E_{cell}^{\circ}$

$H B r O \to B r_{2}; E ° = 1.595$ V, SRP (cathode)

$H B r O \to B r O_{3}^{-}; E ° = - 1.5$ V, SOP (anode)

$2 H B r O \to B r_{2} + B r O_{3}^{-}$

$E_{cell}^{\circ} = SRP (cathode) - SRP (anode)$

$= 1.595 - 1.5 = 0.095$ $V$

$E_{cell}^{\circ} > 0 \Rightarrow Δ G ° < 0 (spontaneous)$

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