MCQ practice · SSC Chemistry Board questions · Chapter 8: Chemistry and Energy
Which will be oxidised first?
Think it through first, then pick an option.
- a OH⁻
- b Cl⁻
- c NO₃⁻
- d SO₄²⁻
Answer and explanation
Correct answer: a OH⁻
OH⁻ is lowest in the anion series, so it gives up electrons and is oxidised first.
Why the other options are wrong
- b Cl⁻: OH⁻ sits below Cl⁻ in the series; at similar concentrations OH⁻ goes first.
- c NO₃⁻: NO₃⁻ is at the top of the series and is oxidised last.
- d SO₄²⁻: SO₄²⁻ is near the top; it comes well after OH⁻.
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