MCQ practice · SSC Chemistry Board questions · Chapter 9: Acid-Base Balance
Which should be applied when the amount of H⁺ in the soil increases?
Think it through first, then pick an option.
- a CaCO₃
- b CaCl₂
- c NH₄Cl
- d (NH₄)₂SO₄
Answer and explanation
Correct answer: a CaCO₃
CaCO₃ is a carbonate that neutralises acid and raises soil pH; the book names lime for this job.
Why the other options are wrong
- b CaCl₂: CaCl₂ is a neutral salt and does not neutralise acid.
- c NH₄Cl: NH₄Cl does not cut soil acidity; ammonium salts push pH down.
- d (NH₄)₂SO₄: (NH₄)₂SO₄ lowers soil pH, so it is wrong when H⁺ is already high.
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