InterviewSolution
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InterviewSolution
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`E_(1),E_(2)` and `E_(3)` are the emf values of the three galvanic cells respectively (i) `Zn|Zn^(2+)(1M)||Cu^(2+)(0.1M)|Cu` (ii) `Zn|Zn^(2+)(1M)||Cu^(2+)(1M)|Cu` (iii)` Zn|Zn^(2+)(0.1M)||Cu^(2+)(1M)|Cu` Which one of the following is true?A. `E_(2) gt E_(3) gt E_(1)`B. `E_(3) gt E_(2) gt E_(1)`C. `E_(1) gt E_(2) gt E_(3)`D. `E_(1) gt E_(3) gt E_(2)`. |
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Answer» Correct Answer - A `Zn+Cu^(2+)toZn^(2+)+Cu` `E_(cell)=E_(cell)^(@)-(0.0591)/(2)"log"([Zn^(2+)])/([Cu^(2+)])` Thus, higher the value of `[Zn^(2+)]//[Cu^(2+)]`, lower is the emf of the cell, `([Zn^(2+)])/([Cu^(2+)])` for `(i)=(1)/(0.1)=10`, for (ii)`=(1)/(1)=1`, for `(iii)=(0.1)/(1)=0.1` Hence, `E_(3) gt E_(2) gt E_(1)`. |
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