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Consider the change in oxidation state o...

Consider the change in oxidation state of Bromine corresponding to different emf values as shown in the diagram below :
.
The the species undergoing dispropprtionation is .

A

` BrO_3^(-)`

B

`BrO_4^(-)`

C

`Br_2`

D

` HBrO`

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The correct Answer is:
D
Calculate `E_(cell)^@` corresponding to each compound undrgoing disproprtionation reaction. The reaction for which ` E_(cell)^@` comes out `+ve` is spontaneous .
`HBrO rarr Br_2 E^@ =1. 595, E_("potential")^@ ("cathode")`
`HBrO rarr BrO_3^- E^@ =- 1.5 E_("oxidation")^@ ("anode")`
`2HBrO rarr Br_(2+) BrO_3^-`
` E_(cell)^@ = E_("potntial")^@ ("cathode") - E_("reduction")^@ ("anode")`
` =2. 595 - 15 = 0. 095 V`
` E_(cell)^@ gt 0 rArr DeltaG^@ lt 0 ["spontaneous"]`
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