Lime is added to an acidic lake and the pH of water increases. Which process is this an example of?
Answer and explanation
Correct answer: Neutralisation
An acidic lake contains an excess of hydrogen ions, so its pH is low. Lime is a basic material; it reacts with or consumes acidic species and reduces the hydrogen-ion effect. As acidity decreases, the pH rises toward the neutral range. This acid-base interaction is called neutralisation. Evaporation only removes solvent, sublimation changes a solid directly to gas, and crystallisation forms crystals; none explains the pH increase. Therefore option A is correct.
Frequently asked questions
What is the correct answer to this question?
Neutralisation
Why is this the correct answer?
An acidic lake contains an excess of hydrogen ions, so its pH is low. Lime is a basic material; it reacts with or consumes acidic species and reduces the hydrogen-ion effect. As acidity decreases, the pH rises toward the neutral range. This acid-base interaction is called neutralisation. Evaporation only removes solvent, sublimation changes a solid directly to gas, and crystallisation forms crystals; none explains the pH increase. 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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