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

1. V 15 . 1 E 2 4 Sn / Sn + = Θ + +
2. V 26 . 1 E Tl / Tl 3 + = Θ +
3. V 66 . 1 – E Al / Al 3 = Θ +
4. V 67 . 1 E 2 4 Pb / Pb + = Θ + +

Correct answer: V 67 . 1 E 2 4 Pb / Pb + = Θ + +

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