If plant growth is poor in acidic soil, which substance can be carefully used to improve its pH?
Answer and explanation
Correct answer: Slaked lime
The governing concept is neutralisation and soil pH management. Acidic soil has a pH below the preferred range for some plants. Slaked lime, Ca(OH)2, is a basic substance; when applied in a suitable measured quantity, it neutralises some soil acidity and raises the pH. Hence option A is correct. Vinegar, lemon juice, and dilute acids are acidic, so adding them would generally increase rather than reduce soil acidity.
Frequently asked questions
What is the correct answer to this question?
Slaked lime
Why is this the correct answer?
The governing concept is neutralisation and soil pH management. Acidic soil has a pH below the preferred range for some plants. Slaked lime, Ca(OH)2, is a basic substance; when applied in a suitable measured quantity, it neutralises some soil acidity and raises the pH. Hence option A is correct. Vinegar, lemon juice, and dilute acids are acidic, so adding them would generally increase rather than reduce soil acidity.
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.
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