If acid is slowly added to a basic solution, what change is expected near neutralisation?
Answer and explanation
Correct answer: pH will come near 7
The governing concept is acid-base neutralisation. A basic solution initially has a pH above 7 because hydroxide ions are present in greater effective concentration. As acid is added, hydrogen ions react with hydroxide ions to form water, so the basicity decreases. Near the neutralisation point, the pH approaches 7, making option A correct. The other choices contradict the direction of the pH change or describe an impossible transformation.
Frequently asked questions
What is the correct answer to this question?
pH will come near 7
Why is this the correct answer?
The governing concept is acid-base neutralisation. A basic solution initially has a pH above 7 because hydroxide ions are present in greater effective concentration. As acid is added, hydrogen ions react with hydroxide ions to form water, so the basicity decreases. Near the neutralisation point, the pH approaches 7, making option A correct. The other choices contradict the direction of the pH change or describe an impossible transformation.
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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