Why does adding 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. Acidic soil contains excess hydrogen ions and therefore has a pH below 7. Slaked lime, calcium hydroxide [Ca(OH)₂], is a base that supplies hydroxide ions. These react with hydrogen ions to form water, reducing acidity and raising the soil pH. Thus option A is correct; the other options describe chemically impossible effects.
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. Acidic soil contains excess hydrogen ions and therefore has a pH below 7. Slaked lime, calcium hydroxide [Ca(OH)₂], is a base that supplies hydroxide ions. These react with hydrogen ions to form water, reducing acidity and raising the soil pH. Thus option A is correct; the other options describe chemically impossible effects.
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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