In an experiment, solution A turns blue litmus red and solution B turns red litmus blue. When mixed in suitable amounts, the temperature rises slightly. This proves which reaction?
Answer and explanation
Correct answer: Neutralisation
The governing concept is acid-base neutralisation. Solution A turns blue litmus red, so it is acidic; solution B turns red litmus blue, so it is basic. When suitable amounts are mixed, hydrogen ions from the acid combine with hydroxide ions from the base to form water, while a salt is produced. The slight temperature rise is consistent with heat released during neutralisation. Therefore option B is correct, not precipitation, evaporation, or sublimation.
Frequently asked questions
What is the correct answer to this question?
Neutralisation
Why is this the correct answer?
The governing concept is acid-base neutralisation. Solution A turns blue litmus red, so it is acidic; solution B turns red litmus blue, so it is basic. When suitable amounts are mixed, hydrogen ions from the acid combine with hydroxide ions from the base to form water, while a salt is produced. The slight temperature rise is consistent with heat released during neutralisation. Therefore option B is correct, not precipitation, evaporation, or sublimation.
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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