STANDARD Chemistry Nernst Equation MCQ Question
The EMF of a cell corresponding to the reaction: Zn(s) + 2H⁺(aq) → Zn²⁺(aq) (0.1 M) + H₂(g) (1 atm) is 0.28 volt at 15°C. The pH of the solution at the hydrogen electrode is (Given: E°{Zn²⁺/Zn} = -0.76 volt; E°{H⁺/H₂} = 0 volt)
7.05
8.62
8.75
9.57
Correct Answer
Detailed Explanation
The half-cell reactions are Zn → Zn²⁺ + 2e⁻ and 2H⁺ + 2e⁻ → H₂. Using the Nernst equation, the pH is calculated as 8.62.
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