AIPMT PRELIMS 2003 Chemistry Nernst Equation MCQ Question
The e.m.f. of a Daniell cell at 298 K is E₁. Zn/SO₄(0.01 M) || CuSO₄(1.0 M)/Cu When the concentration of ZnSO₄ is 1.0 M and that of CuSO₄ is 0.01 M, the e.m.f. is changed to E₂. What is the relationship between E₁ and E₂:
E₁ > E₂
E₁ < E₂
E₁ = E₂
E₂ = 0 ≠ E₁
Correct Answer
Detailed Explanation
According to the Nernst equation, the e.m.f. of the cell depends on the concentration of the ions. Increasing the concentration of Zn²⁺ and decreasing that of Cu²⁺ will increase the e.m.f.
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