MCQ practice · SSC Chemistry Board questions · Chapter 7: Chemical Reactions
What is the oxidation number of sulphur in copper sulphate?
Think it through first, then pick an option.
- a + 2
- b + 4
- c + 6
- d + 8
Answer and explanation
Correct answer: c + 6
CuSO₄: (+2) + x + 4(−2) = 0, x = +6.
Why the other options are wrong
- a + 2: +2 is Cu's value; S in CuSO₄ is +6.
- b + 4: With Cu +2 and four O at −8, S must be +6.
- d + 8: O totals −8, but Cu gives +2, so S = +6.
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