Which of the following substances should a student recommend adding to acidic soil to reduce its acidity?
Answer and explanation
Correct answer: Slaked lime
Slaked lime is calcium hydroxide, Ca(OH)₂, a base that neutralises excess acids in soil. This neutralisation reduces acidity and raises the soil pH toward a more suitable range for plant growth. Hydrochloric acid, vinegar, and lemon juice are acidic substances, so adding them would increase rather than reduce acidity. Therefore the recommended substance is slaked lime, option A.
Frequently asked questions
What is the correct answer to this question?
Slaked lime
Why is this the correct answer?
Slaked lime is calcium hydroxide, Ca(OH)₂, a base that neutralises excess acids in soil. This neutralisation reduces acidity and raises the soil pH toward a more suitable range for plant growth. Hydrochloric acid, vinegar, and lemon juice are acidic substances, so adding them would increase rather than reduce acidity. Therefore the recommended substance is slaked lime, option A.
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.
