Electrode potential for `Mg` electrode varies according to the equation
`E_(Mg^(2+)|Mg)=E_(Mg^(2+)|Mg)^(ϴ) -(0.059)/2 "log" 1/([Mg^(2+)])`
The graph of `E_(Mg^(2+)|Mg) vs log [Mg^(2+)]` is

Options

A.
B.
C.
D.

Answer

B

Explanation

`E_(Mg^(2+)//Mg)=E_(Mg^(2+)//Mg)+(0.059)/(2)log[Mg^(2+)]`
Compare this equation with the equation of straight line y=mx+c.
The graph of `E_(Mg^(2+)//Mg)` vs. log `[Mg^(2+)]` is a straight line with a positive slope and intercept `E_(Mg^(2+)//Mg)`.