A student wants to increase the pH of acidic soil. Which of the following substances should be added to the soil?
Answer and explanation
Correct answer: Slaked lime, Ca(OH)₂
Slaked lime, Ca(OH)₂, is a base. It reacts with acidic substances in the soil and neutralises some of their acidity, thereby increasing the soil pH toward a more suitable range. Therefore option A is correct. Vinegar and lemon juice contain acids, while dilute hydrochloric acid is also acidic; adding any of these would generally lower pH rather than correct acidic soil.
Frequently asked questions
What is the correct answer to this question?
Slaked lime, Ca(OH)₂
Why is this the correct answer?
Slaked lime, Ca(OH)₂, is a base. It reacts with acidic substances in the soil and neutralises some of their acidity, thereby increasing the soil pH toward a more suitable range. Therefore option A is correct. Vinegar and lemon juice contain acids, while dilute hydrochloric acid is also acidic; adding any of these would generally lower pH rather than correct acidic soil.
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.
