JAMB Chemistry 2020 Objective — Question 37

Question 37 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2020 Objective paper, with the correct answer and a full explanation.

37. The oxidation number of sulphur in H2S2O7 is

A. A. 6Correct
B. B. 5
C. C. 4
D. D. 2

Explanation

In H2S2O7 (oleum/pyrosulphuric acid), letting sulphur's oxidation number be x: 2(+1) + 2x + 7(-2) = 0, so 2x = 12, x = +6.

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