A farmer has highly acidic soil and wants to reduce its acidity without harming crop roots. Which substance is most suitable?
Answer and explanation
Correct answer: Slaked lime
Highly acidic soil can be corrected by adding a suitable mild base that neutralises excess acidity. Slaked lime is calcium hydroxide, Ca(OH)₂, and is commonly used in controlled amounts for this purpose; it reacts with acids to form salt and water. Therefore option A is the best choice. Vinegar is acidic and would worsen the condition, while sodium chloride is not a useful neutralising agent and ammonium chloride can contribute to soil acidity rather than correct it.
Frequently asked questions
What is the correct answer to this question?
Slaked lime
Why is this the correct answer?
Highly acidic soil can be corrected by adding a suitable mild base that neutralises excess acidity. Slaked lime is calcium hydroxide, Ca(OH)₂, and is commonly used in controlled amounts for this purpose; it reacts with acids to form salt and water. Therefore option A is the best choice. Vinegar is acidic and would worsen the condition, while sodium chloride is not a useful neutralising agent and ammonium chloride can contribute to soil acidity rather than correct it.
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.
