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Nernst Equation

The emf of th...

Question

The emf of the following three galvanic cells are represented by $E_{1}, E_{2}$ and $E_{3}$ respectively. Which of the following is correct?

(i) $Z n | Z n^{2 +} (1 M) | | C u^{2 +} (1 M) | C u$
(ii) $Z n | Z n^{2 +} (0.1 M) | | C u^{2 +} (1 M) | C u$
(iii) $Z n | Z n^{2 +} (1 M) | | C u^{2 +} (0.1 M) | C u$

E_{1} > E_{2} > E_{3}

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E_{3} > E_{2} > E_{1}

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E_{3} > E_{1} > E_{2}

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E_{2} > E_{1} > E_{3}

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Solution

The correct option is D $E_{2} > E_{1} > E_{3}$
Option $D$ is the correct answer.
$E_{2} > E_{1} > E_{3}$
With an increase in the concentration of Zn(II) ions, the emf of cell decreases.
With increase in the concentration of Cu(II) ions, the emf of cell increases.

$E_{c e l l} = E_{c e l l}^{o} - \frac{0.0592}{2} l o g \frac{[Z n^{2 +}]}{[C u^{2 +}]}$

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Similar questions

Below given are emf of three galvanic cells, represented by $E_{1}$ , $E_{2}$ and $E_{3}$ . Which of the following is true?

I. $Z n | Z n^{2 +} (1 M) | | C u^{2 +} (1 M) | C u$

II. $Z n | Z n^{2 +} (0.1 M) | | C u^{2 +} (1 M) | C u$

III. $Z n | Z n^{2 +} (1 M) | | C u^{2 +} (0.1 M) | C u$

E_{1}, E_{2}, E_{3}

Z n | Z n_{1 M}^{2 +} | | C u_{0.1 M}^{2 +} | C u

Z n | Z n_{1 M}^{2 +} | | C u_{1 M}^{2 +} | C u

Z n | Z n_{0.1 M}^{2 +} | | C u_{1 M}^{2 +} | C u

Z n | Z n^{2 +} (1 M) | | C u^{2 +} (1 M) | C u

Z n | Z n^{2 +} (0.1 M) | | C u^{2 +} (1 M) | C u

Z n | Z n^{2 +} (1 M) | | C u^{2 +} (0.1 M) | C u

E_{1}

E_{2}

E_{3}

(E^{\circ})

A g / A g^{+} (1 M) ∥ C u^{2 +} (1 M) | C u; E^{\circ} = - 0.46 v o l t

Z n / Z n^{2 +} (1 M) ∥ C u^{2 +} (1 M) | C u; E^{\circ} = + 1.10 v o l t

Z n | Z n^{2 +} (1 M) ∥ A g^{+} (1 M) | A g

E_{1}, E_{2} a n d E_{3}

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