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The Standard reduction potential values,...

The Standard reduction potential values, `E^(@)(Bi^(3+)//Bi)` and `E^(@)(Cu^(2+)//Cu)` are 0.226 V and 0.344 V respectively. A mxiture of salt of bismut and copper at unit concentration each is electrolysed at `25^(@)C` to what value can `[Cu^(2+)]` be brought down before bismuth starts to deposit, in electrolysis.

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The correct Answer is:
`[Cu^(2+)]=10^(-4)M`
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