1. Tardigrade
  2. Question
  3. Chemistry
  4. The electrode potential, E° , for the reduction of MnO4- to Mn2 + in acidic medium is +1.51 V. Which of the following metal(s) will be oxidised? The reduction reactions and standard electrode potentials for Zn2 +,Ag+ and Au+ are given as Zn(a q)2 ++2e- arrow Zn(s),E° =-0.762 V Ag(a q)++e-leftharpoons Ag(s),E° =+0.80 V Au(a q)++e-leftharpoons Au(s),E° =+1.69 V

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Q. The electrode potential, $E^\circ $ , for the reduction of $MnO_{4}^{-}$ to $Mn^{2 +}$ in acidic medium is $ +1.51\, V$. Which of the following metal(s) will be oxidised? The reduction reactions and standard electrode potentials for $Zn^{2 +},Ag^{+}$ and $Au^{+}$ are given as
$Zn_{\left(a q\right)}^{2 +}+2e^{-} \rightarrow Zn_{\left(s\right)},E^\circ =-0.762\,V$
$Ag_{\left(a q\right)}^{+}+e^{-}\rightleftharpoons Ag_{\left(s\right)},E^\circ =+0.80\,V$
$Au_{\left(a q\right)}^{+}+e^{-}\rightleftharpoons Au_{\left(s\right)},E^\circ =+1.69\,V$

NTA AbhyasNTA Abhyas 2022

Solution:

More +ve the value of reduction potential more will be the tendency to undergo reduction.
The $E _{\text {red }}^{0}\left( MnO _{4}^{-} \mid Mn ^{2+}\right)=+1.51 V$ value is greater than $E _{\text {red }}^{0}\left( Zn ^{2}+\mid Zn \right)=-0.762 V$ and $E _{\text {red }}^{0}\left( Ag ^{+} \mid Ag \right)=+0.80 V$. Thus, only $Zn$ and $Ag$ will be oxidised.