Question

Given below are few statements regarding electrode potentials , Mark the correct statements.
(i) The potential associated with each electrode is known as electrodes potential.
(ii) A negative $E^0$ means that the redox couple is a stronger reducing agent than $H^{+}/H_2$ couple.
(iii) A positive $E^0$means that the redox couple is a weaker reducing agent than $H^{+}/H_2$couple.

• A. (i) and (ii)
• B. (i) and (iii)
• C. (ii) and (iii)
• D. (i), (ii) and (iii)

Answer 1

The correct option is D (i), (ii) and (iii)

i) Electrodes potential is the potential associated with each electrode in a cell.

ii) A negative $E^0$ means that the tendency of the element to get reduced is less than the standard reduction potential of hydronium ions into hydrogen gas. Thus the redox couple will tend to get oxidise easily and is a stronger reducing agent than $H^{+}/H_2$ couple.

iii) A positive $E^0$ means that the tendency of the element to get reduced is more than the standard reduction potential of hydronium ions into hydrogen gas. Thus the redox couple will tend to get reduce easily and is a stronger oxidising agent or weaker reducing agent than $H^{+}/H_2$ couple.