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Electrochemical Cells, Galvanic Cells

The standard ...

Question

The standard reducation potentials of
$Z n^{2 +} | Z n, C u^{2 +} | C u$ and $A g^{+} | A g$
are respectively -0.76, 0.34 and 0.8 V. The following cells were constructed.
a) $Z n | Z n^{2 +} | | C u^{2 +} | C u$
b) $Z n | Z n^{2 +} | | A g^{+} | A g$
c) $C u | C u^{2 +} | | A g^{+} | A g$
What is the correct order $E {^{0}}_{c e l l}$ of these cells?

b>c>a

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b>a>c

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a>b>c

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c>a>b

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Solution

The correct option is B b>a>c
$a) Z n | Z n^{2 +} | | C u^{2 +} | C u, E_{c e l l}^{\circ} = - (- 0.76) + 0.34$

$= 1.10$

$b) Z n | Z n^{2 +} | | A g^{+} | A g, E_{c e l l}^{\circ} = - (0.76) + 0.8$

$= 1.56$

$c) C u | C u^{2 +} | | A g^{+} | A g, E_{c e l l}^{\circ} = - 0.34 + 0.8$

$= 0.46$

$∴$ Cell potentials are in the order:
$b > a > c$

Hence, option B is correct.

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