Which substance is used to reduce the alkalinity of highly basic soil?
Answer and explanation
Correct answer: Organic matter
Highly basic soil has an excess of alkaline substances and needs an acidic or acid-forming amendment. Organic matter such as compost decomposes through microbial activity and produces organic acids, which gradually neutralise some alkalinity and improve soil condition. Sodium hydroxide and washing soda are alkaline, so they would increase alkalinity. Bleaching powder is not the suitable routine amendment for this purpose. Therefore, option A is correct.
Frequently asked questions
What is the correct answer to this question?
Organic matter
Why is this the correct answer?
Highly basic soil has an excess of alkaline substances and needs an acidic or acid-forming amendment. Organic matter such as compost decomposes through microbial activity and produces organic acids, which gradually neutralise some alkalinity and improve soil condition. Sodium hydroxide and washing soda are alkaline, so they would increase alkalinity. Bleaching powder is not the suitable routine amendment for this purpose. Therefore, option 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.
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