Question

Electrode potential for $Mg$ electrode varies according to the equation
$E_{M{g}^{2+}/Mg}=E_{M{g}^{2+}/Mg}^{\circ }-\frac{0.059}{2}$ log $\frac{1}{\left[M{g}^{2+}\right]}$
The graph of $E_{M{g}^{2+}}|Mg$ vs log $\left[M{g}^{2+}\right]$ is

• A.
• B.
• C.
• D.

Answer 1

Answer: (B)

$E_{M{g}^{2+}/Mg}=E_{M{g}^{2+}/Mg}^{\circ }+\frac{0.059}{2}$ log $\left[M{g}^{2+}\right]$
Compare this equation with the equation of straight line $y=mx+c$
The graph of $E_{M{g}^{2+}}/Mg$ vs log $\left[M{g}^{2+}\right]$ is a is a straight line with a positive slope and intercept $=E_{M{g}^{2+}/Mg}^{\circ }$