Why does adding a suitable amount of slaked lime to acidic soil increase the pH?
Answer and explanation
Correct answer: Slaked lime is basic and reduces acidity
Acidic soil contains acidic substances and therefore has a relatively low pH. Slaked lime is calcium hydroxide, Ca(OH)2, a basic compound that supplies hydroxide ions. These ions neutralise acidic hydrogen ions, producing water, while the calcium component forms salts. With a suitable amount, the acidity decreases and the soil pH rises toward a more suitable range. A is correct; B states the opposite, C is chemically unrelated, and D makes an unsupported claim about removing all salts.
Frequently asked questions
What is the correct answer to this question?
Slaked lime is basic and reduces acidity
Why is this the correct answer?
Acidic soil contains acidic substances and therefore has a relatively low pH. Slaked lime is calcium hydroxide, Ca(OH)2, a basic compound that supplies hydroxide ions. These ions neutralise acidic hydrogen ions, producing water, while the calcium component forms salts. With a suitable amount, the acidity decreases and the soil pH rises toward a more suitable range. A is correct; B states the opposite, C is chemically unrelated, and D makes an unsupported claim about removing all salts.
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.
