MCQ practice · SSC Chemistry Board questions · Chapter 7: Chemical Reactions
Fe₂(SO₄)₃(aq) + 6NaOH(aq) → 2Fe(OH)₃ + 3Na₂SO₄; what type of reaction is this?
Think it through first, then pick an option.
- a Redox
- b Displacement
- c Precipitation
- d Isomerization
Answer and explanation
Correct answer: c Precipitation
Soluble reactants give insoluble Fe(OH)₃.
Why the other options are wrong
- a Redox: Fe stays +3; no oxidation number changes.
- b Displacement: By the book's definition this is precipitation: insoluble Fe(OH)₃ forms.
- d Isomerization: Isomerization turns one compound into an isomer; here two reactants react.
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