A farmer's soil has pH 4.5. Which treatment is suitable?
Answer and explanation
Correct answer: Add a suitable amount of slaked lime
The pH scale shows that a value of 4.5 represents acidic soil. Slaked lime, calcium hydroxide [Ca(OH)₂], is a basic substance, so adding an appropriate quantity helps neutralise excess acidity and raise the soil pH toward a suitable range. The amount must be based on soil testing because excessive lime can also disturb soil conditions. Vinegar, lemon juice, and dilute acid are acidic materials; adding them would intensify rather than correct the problem. Therefore A is correct.
Frequently asked questions
What is the correct answer to this question?
Add a suitable amount of slaked lime
Why is this the correct answer?
The pH scale shows that a value of 4.5 represents acidic soil. Slaked lime, calcium hydroxide [Ca(OH)₂], is a basic substance, so adding an appropriate quantity helps neutralise excess acidity and raise the soil pH toward a suitable range. The amount must be based on soil testing because excessive lime can also disturb soil conditions. Vinegar, lemon juice, and dilute acid are acidic materials; adding them would intensify rather than correct the problem. Therefore A is correct.
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.
Student feedback
Was this question useful?
👍 0 Helpful 👎 0 Not helpful
Yes 0% No 0%
0 responsesStudent Reviews
No published reviews yet.
