A farmer tests soil and finds its pH to be 5. Which measure is suitable to improve crop growth?
Answer and explanation
Correct answer: Add slaked lime
A soil pH of 5 indicates that the soil is acidic. Slaked lime, Ca(OH)₂, is a basic substance; when applied in a suitable quantity, it neutralises some excess acidity and moves the soil pH toward a range more favourable for many crops. Adding acid or vinegar would increase acidity. Large additions of ammonium chloride are not a suitable correction because such fertiliser can contribute to soil acidification. Thus A is correct.
Frequently asked questions
What is the correct answer to this question?
Add slaked lime
Why is this the correct answer?
A soil pH of 5 indicates that the soil is acidic. Slaked lime, Ca(OH)₂, is a basic substance; when applied in a suitable quantity, it neutralises some excess acidity and moves the soil pH toward a range more favourable for many crops. Adding acid or vinegar would increase acidity. Large additions of ammonium chloride are not a suitable correction because such fertiliser can contribute to soil acidification. Thus A is correct.
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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