MCQ practice · SSC Chemistry Board questions · Chapter 7: Chemical Reactions
In Sn⁴⁺ + Fe²⁺ → Sn²⁺ + Fe³⁺, which is reduced?
Think it through first, then pick an option.
- a Fe²⁺
- b Fe³⁺
- c Sn²⁺
- d Sn⁴⁺
Answer and explanation
Correct answer: d Sn⁴⁺
Sn⁴⁺ takes two electrons to become Sn²⁺; charge falls, so it is reduced.
Why the other options are wrong
- a Fe²⁺: Fe²⁺ gives up one electron to become Fe³⁺, so it is oxidized.
- b Fe³⁺: Fe³⁺ is a product formed from oxidized Fe²⁺.
- c Sn²⁺: Sn²⁺ is a product; the reactant Sn⁴⁺ was reduced.
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