InterviewSolution
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InterviewSolution
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Consider the following concentration cell`:` `Zn(s)|Zn^(2+)(0.024M)||Zn^(2+)(0.480M)|Zn(s)` which of the following statements is `//` are correct?A. The `EMF` of the cell at `25^(@)C` is nearly `+0.039V.`B. The `EMF` of the cell at `25^(@)C` is nearly `-0.039V`.C. If water is added in `LHE`, so that the `[Zn^(2+)]` is reduced to `0.012 M`, the cell voltage increases.D. If water is added in `LH` , so that the `[Zn^(2+)]` is reduced to `0.012M` , the cell voltage decreases. |
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Answer» Correct Answer - a,c Cell reaction `:Zn^(2+)(0.484M) rarr Zn^(2+)(0.024M)` `E_(cell)=0-(0.059)/(2) log ((0.024)/(0.480))=0.039V` For `:Zn^(2+)(0.484M)rarr Zn^(2+)(0.12M)` `implies E_(cell)=0-(0.059)/(2) log ((0.012)/(0.48))` `=0.03(1.6)=0.048V` |
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