Which substance should a farmer add to acidic soil to increase its pH?
Answer and explanation
Correct answer: Calcium oxide
The pH of acidic soil is increased by adding a basic substance that neutralises excess acidity. Calcium oxide is a basic oxide and reacts with acidic components to reduce their effect, so option A is correct. Sodium chloride is essentially a neutral salt, while ethanoic acid would add acidity. Carbon dioxide can form carbonic acid in moist soil and is therefore not the suitable choice.
Frequently asked questions
What is the correct answer to this question?
Calcium oxide
Why is this the correct answer?
The pH of acidic soil is increased by adding a basic substance that neutralises excess acidity. Calcium oxide is a basic oxide and reacts with acidic components to reduce their effect, so option A is correct. Sodium chloride is essentially a neutral salt, while ethanoic acid would add acidity. Carbon dioxide can form carbonic acid in moist soil and is therefore not the suitable choice.
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.
