In which of the following half cells, electrochemical reaction is pH dependent?
In which of the following half cells, electrochemical reaction is pH dependent?
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- \( Pt\,|\,F{e^{3 + }},\,F{e^{2 + }} \)
- \( MnO_4^ - \,|M{n^{2 + }} \)
- \( Ag\,|\,AgCl\,|C{l^{ - 1}} \)
- \( {1 \over 2}{F_2}\,|{F^ - } \)
The Correct Option is B
Solution and Explanation
Step 2: Only the permanganate half reaction contains H+, so its Nernst equation E = E\(^\circ\) \(-\) (0.059/5) log\(\dfrac{[Mn^{2+}]}{[MnO_4^-][H^+]^8}\) depends on pH.
Answer: (B) MnO4\(-\) | Mn2+
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