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Post-UTME Chemistry 2016 Objective — Question 5

Question 5 of 20 from the Post-UTME Screening (Post-UTME) Chemistry 2016 Objective paper, with the correct answer and a full explanation.

The oxidation number of Sulphur in the ion S2O3 2- is

A. -3
B. -2
C. +2Correct
D. +3

Explanation

Let x = oxidation state of S: 2x + 3(-2) = -2, so 2x = 4, x = +2.

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