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InterviewSolution
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`E^(@) (SRP)` of different half cell given `{:(E_(Cu^(2+)//Cu)^(@) =0.34"volt",,,E_(Zn^(2+)//Zn)^(@) =- 0.76"volt"),(E_(Ag^(+)//Ag)^(@) = 0.8"volt",,,E_(Mg^(2+)//Mg)^(@) =- 2.37 "volt"):}` In which cell `Delta^(@)` is most negative:-A. `Zn|Zn^(2+)(1 M)||Mg^(2+)(1 M)|Mg`B. `Zn|Zn^(2+)(1 M)||Ag^(+)(1 M)|Ag`C. `Cu|Cu^(2+)(1 M)||Ag^(+)(1 M)|Ag`D. `Ag|Ag^(+)(1 M)||Mg^(2+)(1 M)|Mg` |
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Answer» Correct Answer - B (b) (a)`Zn|Zn^(2+)(1 M)||Mg^(2+)(1M)|Mg` `E_(cell)^(@)=E_(cathode)^(@)-E_(anode)^(@)=E_(Mg^(2+)//Mg)^(@)-E_(Zn^(2+)//Zn)^(@)` `=-2.37-(-0.76)=-1.61" V"` `DeltaG^(@)=-nFE_(cell)^(@)=-2xx96500(C )xx(-1.61" V")` `=+310,730" CV"=+310.730" kJ"` (b) `Zn|Zn^(2+)(1 M)||Ag^(+)(1 M)|Ag` `E_(cell)^(@)=E_(Ag^(+)//Ag)^(@)-E_(Zn^(2+)//Zn)^(@)` `=0.80-(-0.76)=+1.56" V"` `DeltaG^(@)=-nFE_(cell)^(@)=-2xx96500" C"xx1.56" V"` `=-301,080" CV"` `=-301.08" CV"` (c )`Cu|Cu^(2+)(1 M)||Ag^(+)(1M)|Ag` `E_(cell)^(@)=E_(Ag^(+)//Ag)^(@)-E_(Cu^(2+)//Cu)^(@)` `=0.80-0.34=+0.46" V"` `DeltaG^(@)=-nFE_(cell)^(@)=-2xx96500" C"xx-0.46" V"` `=-88,780" CV"=-88.780" kJ"` (d)`Ag|Ag^(+)(1 M)||Mg^(+)(1M)|Mg` `E_(cell)^(@)=E_(Mg^(2+)//Mg)^(@)-E_(Ag^(+)//Ag)^(@)` `=-2.37-0.80=-3.17" V"` `DeltaG^(@)=-nFE_(cell)^(@)=-2xx96500" C"xx(-3.17" V")` `=+611,810" CV"=+611.0810" kJ"` (b) has maximum negative `DeltaG^(@)` value. |
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