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Following reactions occur at cathode dur...

Following reactions occur at cathode during the electrolysis of aqueous silver chloride solution :
`Ag^(+)(aq)+e rarr Ag(s)E^(@)=+0.80V`
`H^(+)(aq)+erarr(1)/(2)H_(2)(g)E^(@)=+0.00V`
Onn the basis of their standard reduction electrode potential `(E^(@))` values, which reaction is feasible at the cathode and why?

Text Solution

Verified by Experts

Between the two half - cell reduction reactions, the one with larger `E^(@)`value has a greater tendency to occur from left to right. Therefore, at the cathode `Cu^(2+)` ions will get reduced in preference to the reduction of `H^(+)` ions.
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Knowledge Check

  • The two half - cell reactions of an electrochemical cell is given as - Ag^(+)+e rarr Ag, E_(Ag^(+)|Ag)^(@)=-0.3995V Fe^(2+)rarr Fe^(3+)+e, E_(Fe^(3+)|Fe^(2+))^(@)=-0.7120V The value of cell Ecell will be -

    A
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    B
    `0.3125V`
    C
    `1.114V`
    D
    `-1.114V`

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