Question

Consider the following redox reaction occurring in acidic medium

The unknown standard reduction potential is

• A. -1.6 V
• B. 1.6 V
• C. -1.52 V
• D. 1.52 V

Answer 1

Answer: (D)

The given half reactions are

Adding $BrO _{3}^{-}+5 e ^{-} +6 H ^{+} \longrightarrow \frac{1}{2} Br _{2}+3 H _{2} O $
$ \Delta G^{\circ} =-7.6\, F =-5\, E ^{\circ} F $
$ E^{\circ} =\frac{7.6}{5}=1.52\, V$