Thermodynamics

Question
CBSEENCH11008472

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

BrO4- 1.82BrO3-1.5 VHBrO1.595Br21.0652 VBr-

Then the species undergoing disproportionation is

  • BrO3-

  • BrO4-

  • HBrO

  • Br2

Solution

C.

HBrO

Calculate Ecell° corresponding to each compound undergoing disproportionation reaction. The reaction for which Ecell° comes out +ve is spontaneous.

HBrO   Br2Eo = 1.595 V, SRP (cathode)HBrO    BrO3-Eo = - 1.5 V, SOP (anode)2HBrO   Br2 + BrO3-Ecello = SRP (cathode)- SRP (anode)= 1.595 - 1.5= 0.095 VEcell0> 0  Go < 0 [spontaneous]

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