Why do farmers add slaked lime to soil when its pH is too low?
Answer and explanation
Correct answer: To reduce acidity and make soil suitable
A very low pH indicates that the soil is strongly acidic. Slaked lime, Ca(OH)2, is a basic substance, so it reacts with and neutralises excess acidic substances in the soil. This raises the pH toward a range more suitable for crop growth. The purpose is not to increase acidity, add ordinary salt, or remove water. Because the treatment is an acid-base neutralisation, option A gives the correct reason.
Frequently asked questions
What is the correct answer to this question?
To reduce acidity and make soil suitable
Why is this the correct answer?
A very low pH indicates that the soil is strongly acidic. Slaked lime, Ca(OH)2, is a basic substance, so it reacts with and neutralises excess acidic substances in the soil. This raises the pH toward a range more suitable for crop growth. The purpose is not to increase acidity, add ordinary salt, or remove water. Because the treatment is an acid-base neutralisation, option A gives the correct reason.
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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