MCQ practice · SSC Chemistry Board questions · Chapter 9: Acid-Base Balance
Which of the following controls excess alkalinity of soil?
Think it through first, then pick an option.
- a NH₄OH
- b NaHCO₃
- c Ca(OH)₂
- d (NH₄)₂SO₄
Answer and explanation
Correct answer: d (NH₄)₂SO₄
When soil pH is high, ammonium sulfate fertiliser brings it down.
Why the other options are wrong
- a NH₄OH: NH₄OH is an alkali and would make the soil more alkaline.
- b NaHCO₃: NaHCO₃ is basic in nature and will not lower pH.
- c Ca(OH)₂: Ca(OH)₂ is an alkali; lime-type substances raise pH.
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