Why does pH increase when slaked lime is added to acidic soil?
Answer and explanation
Correct answer: Slaked lime is basic and reduces acidity
The governing concept is neutralisation. Slaked lime is calcium hydroxide, Ca(OH)2, which is a basic substance. In acidic soil, its hydroxide ions react with acidic hydrogen ions and reduce the effective acidity; in simplified form, H+ + OH− → H2O. As hydrogen-ion concentration falls, pH rises. Therefore option A is correct, whereas B, C, and D contradict the chemical behaviour of lime.
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 neutralisation. Slaked lime is calcium hydroxide, Ca(OH)2, which is a basic substance. In acidic soil, its hydroxide ions react with acidic hydrogen ions and reduce the effective acidity; in simplified form, H+ + OH− → H2O. As hydrogen-ion concentration falls, pH rises. Therefore option A is correct, whereas B, C, and D contradict the chemical behaviour of lime.
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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