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E_(1),E_(2) and E_(3) are the emfsof the following three galvanic cells respectively. (i)Zn_((s))|Zn^(2+)(0.1M)||Cu^(2+)(1M)|Cu_((s)) (ii)Zn_((s))|Zn^(2+)(1M)||Cu^(2+)(1M)|Cu_((s)) (iii)Zn_((s))|Zn^(2+)(1M)||Cu^(2+)(0.1M)|Cu_((s)) Which one of the following is true? |
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Answer» `E_(2)gtE_(1)gtE_(3)` `E_(red)^(@)` for `Cu^(2)//Cu=0.35V` `E_("ox")^(@)` for `Zn//Zn^(2+)`=0.76 V `THEREFORE E_(cell)^(@)=E_(red)^(@)+E_("ox")^(@)=0.35+0.76=1.11V` `Zn_(s)|Zn^(2+)(0.1M)|Cu^(2+)(1M)|CU_(s)`,`E_(1)` `E_(cell)=E_(cell)^(@)-(0.0591)/(n)log[(Zn^(2+))/(Cu^(2+))]` `=1.11-(0.591)/(2)log(0.1)/(1)=1.11+(0.591)/(2)toE_(1)` (ii)For`Zn_(s)|Zn^(2+)(1M)|Cu^(2+)(1M)|Cu_(s)` `E_(cell)=1.11-(0.591)/(2)log(1)/(1)` `E_(cell)=1.11toE_(2)` (III)Fo`Zn_(s)|Zn^(2+)(1M)||Cu^(2+)(1M)|Cu_(s)` `E_(cell)=1.11-(0.0591)/(2)log(1)/(0.1)=1.11-(0.0591)/(2)toE_(3)` `therefore E_(1)gtE_(2)gtE_(3)`. |
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