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Question

Electrode potentials are:
Zn0Zn2++2e; E0=+0.76V
Au0Au3++3e; E0=1.42V
What is the potential of the reaction, if a gold foil is kept in a solution containing zinc ions?

A
1.34 V (no reaction)
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B
+1.34 V (no reaction)
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C
2.18 V (no reaction)
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D
+2.18 V (reaction)
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E
0.66 V (reaction)
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Solution

The correct option is C 2.18 V (no reaction)
Eocell=EoAuEoZn=1.420.76=2.18V
Since, the cell potential is negative, the reaction is non spontaneous. Hence, no reaction will occur.
Au3+ ions are better oxidizing agent than Zn2+ ions.
Similarly, Zn is better reducing agent than Au.

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