WAEC Chemistry 2014 Objective — Question 16
Question 16 of 50 from the West African Examinations Council (WAEC) Chemistry 2014 Objective paper, with the correct answer and a full explanation.
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The oxidation number of sulphur in Fe₂(SO₄)₃ is
- A. +2
- B. +3
- C. +4
- D. +6Correct
Explanation
Let oxidation number of S be S. O=-2, Fe=+3. In Fe2(SO4)3: (+3×2)+3(S+(-2×4))=0. Solving: 6+3(S-8)=0, S=+6.
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