Why does adding a suitable amount of slaked lime to acidic soil increase pH?
Answer and explanation
Correct answer: Slaked lime is basic and reduces acidity
The governing concept is acid-base neutralisation. Slaked lime is calcium hydroxide, Ca(OH)₂, a basic substance. In acidic soil, its hydroxide ions react with excess hydrogen ions, reducing acidity and moving the pH upward toward a suitable range. Therefore option A is correct. B reverses the chemical effect, while C and D describe impossible changes and do not explain pH.
Frequently asked questions
What is the correct answer to this question?
Slaked lime is basic and reduces acidity
Why is this the correct answer?
The governing concept is acid-base neutralisation. Slaked lime is calcium hydroxide, Ca(OH)₂, a basic substance. In acidic soil, its hydroxide ions react with excess hydrogen ions, reducing acidity and moving the pH upward toward a suitable range. Therefore option A is correct. B reverses the chemical effect, while C and D describe impossible changes and do not explain pH.
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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