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InterviewSolution
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The emf of the following three galvanic cells :`1. Zn//Zn^(2+) ( 1M) || Cu^(2+) (1 M) //Cu` `2. Zn//ZN^(2+ ) (1 M)|| Cu^(2+) //cu `3. Zn//Zn^(2+) (1 M) || Cu^(2+) (0.1 M) Cu` are repersented by `E_1, E_2, E_3` which of the following statement is true ?A. `E_(1) gt E_(2) gt E_(3)`B. `E_(3) gt E_(2) gt E_(1)`C. `E_(3) gt E_(1) gt E_(2)`D. `E_(2) gt E_(1) gt E_(3)`. |
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Answer» Correct Answer - D (d) According to Nernst equation `E_(cell)=E_(cell)^(@)-(0.0591)/(n)"log"([Zn^(2+)])/([Cu^(2+)])` In first case :`([Zn^(2+)])/([Cu^(2+)])=1` `:. E_(cell)(E_(1))=E_(cell)^(@)` In third case , `([Zn^(2+)])/([Cu^(2+)])=((1M))/((0.1 M))=10` `E_(cell)(E_(3))=E_(cell)^(@)-(0.0591)/(2)` `=E_(cell)^(@)-0.02955` Thus,`E_(2) gt E_(1) gt E_(3)`. |
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