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Electrochemical Cells, Galvanic Cells

In which of t...

Question

In which of the following case, increase on concentration of ion cause increase in $E_{c e l l}$ ?

P t (H_{2}) H^{+} (a q)

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P t | Q u i n h y d r o n e | H^{+} (a q)

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A g | A g^{+} (a q)

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A g, A g C l | C l^{-} (a q)

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Solution

The correct option is D $A g, A g C l | C l^{-} (a q)$
(a) $\frac{1}{2} H_{2} (g) \to H^{+} (a q) + e^{-}$
$E_{c e l l} = E_{c e l l}^{o} - 0.0591$ log $[H^{+}]$
(c) $A g (s) \to A g^{+} (a q)$
$E_{c e l l} = E_{c e l l}^{o} - 0.0591 l o g [A g^{+}]$
(d) $A g (s) + C l^{-} (a q) \to A g C l (s) + e^{-}$
$E_{c e l l} = E_{c e l l}^{o} - 0.0591 l o g \frac{1}{[C l^{-}]}$ .
Thus, in case(d), the $E_{c e l l}$ increases with increase in the concentration of ions.

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