If the pH of soil becomes very low, which substance can a farmer add to improve it?
Answer and explanation
Correct answer: Slaked lime
The governing concept is neutralisation and pH correction. A very low pH indicates that the soil is strongly acidic. Slaked lime, calcium hydroxide, is a basic substance; when added in a suitable amount, it reacts with excess acidity and raises the soil pH toward a more suitable range. Therefore option A is correct. Lemon juice, vinegar, and tamarind water are acidic and would intensify the problem.
Frequently asked questions
What is the correct answer to this question?
Slaked lime
Why is this the correct answer?
The governing concept is neutralisation and pH correction. A very low pH indicates that the soil is strongly acidic. Slaked lime, calcium hydroxide, is a basic substance; when added in a suitable amount, it reacts with excess acidity and raises the soil pH toward a more suitable range. Therefore option A is correct. Lemon juice, vinegar, and tamarind water are acidic and would intensify the problem.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
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