A farmer's soil has pH 8.5. He wants to reduce its basicity. Which method would be more suitable?
Answer and explanation
Correct answer: Adding organic matter to slowly increase acidity
A pH of 8.5 indicates that the soil is alkaline because it is above 7. To lower basicity, the soil should receive a suitable mildly acidic amendment rather than another strong base. Organic matter can decompose and produce acidic substances gradually, helping improve alkaline soil when used appropriately. Slaked lime, sodium hydroxide and soap are basic materials and would tend to maintain or increase alkalinity. Therefore option A is the most suitable choice.
Frequently asked questions
What is the correct answer to this question?
Adding organic matter to slowly increase acidity
Why is this the correct answer?
A pH of 8.5 indicates that the soil is alkaline because it is above 7. To lower basicity, the soil should receive a suitable mildly acidic amendment rather than another strong base. Organic matter can decompose and produce acidic substances gradually, helping improve alkaline soil when used appropriately. Slaked lime, sodium hydroxide and soap are basic materials and would tend to maintain or increase alkalinity. Therefore option A is the most suitable choice.
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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