Post-UTME Chemistry 2018 Objective — Question 1
Question 1 of 21 from the Post-UTME Screening (Post-UTME) Chemistry 2018 Objective paper, with the correct answer and a full explanation.
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H2S + Cl2 -> 2HCl + S. In the reaction above, the oxidation number of chlorine changed from
- A. 0 to -1Correct
- B. -1 to 0
- C. -2 to 0
- D. 0 to 2
Explanation
Chlorine in Cl2 has oxidation number 0; in HCl it is -1. The oxidation number changes from 0 to -1.
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