Question

The standard reduction potential values of some of the p-block ions are given below. Predict the one with the strongest oxidising capacity.

(1) \(\mathrm{E}_{\mathrm{Sn}^{4+} / \mathrm{Sn}^{2+}}^{\ominus}=+1.15 \mathrm{~V}\)

(2) \(\mathrm{E}_{\mathrm{T}l^{3+} / \mathrm{T} l}^{\ominus}=+1.26 \mathrm{~V}\)

(3) \(\mathrm{E}_{\mathrm{Al}^{3+} / \mathrm{Al}}^{\ominus}=-1.66 \mathrm{~V}\)

(4) \(\mathrm{E}_{\mathrm{Pb}^{4+} / \mathrm{Pb}^{2+}}^{\ominus}=+1.67 \mathrm{~V}\)

Answer 1

Correct option is (4) \(\mathrm{E}_{\mathrm{Pb}^{4+} / \mathrm{Pb}^{2+}}^{\ominus}=+1.67 \mathrm{~V}\)   

Standard reduction potential value (+ve) increases oxidising capacity increases.