Question

Given below are few reactions with some expressions. Mark the expression which is not correctly matched.

• A. For concentration cell,
  $Ag\left|Ag^{+}\left(C_{1}\right)\right|\left|Ag^{+}\left(C_{2}\right)\right|Ag$ ;
  $E_{cell}=-\frac{0.0591}{1}log \frac{C_{1}}{C_{2}}$
• B. For the cell, $2Ag^{+}+H_{2}\left(1\,atm\right) \to2Ag+2H^{+}\left(1\,M\right)$ ;
  $E_{cell}=E^{\circ}_{cell}-\frac{0.0591}{2}log \frac{\left[Ag^{+}\right]^{2}}{\left[H^{+}\right]^{2}}$
• C. For an electrochemical reaction, at equilibrium
  $aA +bB \xrightleftharpoons{ne^-} cC +dD$ ;
  $E^{\circ}_{cell}=\frac{0.0591}{n}log \frac{\left[C\right]^{c}\left[D\right]^{d}}{\left[A\right]^{a}\left[B\right]^{b}}$
• D. For the cell, $M^{n+}_{\left(aq\right)}+ne^{-} \to M_{\left(s\right)}$ ;
  $E=E^{\circ}-\frac{0.0591}{n} log \frac{1}{\left[M^{n+}\right]}$

Answer 1

Answer: (B)

For $2Ag^{+}+H_{2}\left(1\,atm\right) \to2Ag +2H^{+}\left(1\,M\right)$
$E_{cell}=E^{\circ}_{cell}-\frac{0.0591}{2}log \frac{\left[H^{+}\right]^{2}}{\left[Ag^{+}\right]^{2}}$