The pH of a lake decreases due to acid rain. Adding lime raises the pH. What type of process is this?
Answer and explanation
Correct answer: Neutralisation
Acid rain introduces acidic substances into the lake and lowers its pH. Lime is a basic material, commonly represented by calcium oxide or calcium hydroxide in this context. It reacts with acidic substances and reduces their acidity, thereby raising the pH toward a less acidic value. This acid–base reaction is neutralisation, not evaporation, condensation, or decomposition. Hence option A is correct.
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What is the correct answer to this question?
Neutralisation
Why is this the correct answer?
Acid rain introduces acidic substances into the lake and lowers its pH. Lime is a basic material, commonly represented by calcium oxide or calcium hydroxide in this context. It reacts with acidic substances and reduces their acidity, thereby raising the pH toward a less acidic value. This acid–base reaction is neutralisation, not evaporation, condensation, or decomposition. Hence 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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