When acid is added to a basic solution, universal indicator changes from blue to green. What is the conclusion?
Answer and explanation
Correct answer: The solution became nearly neutral
The governing concept is acid–base neutralisation shown through pH colour changes. Blue indicates a basic solution, whereas green is characteristic of a nearly neutral solution around pH 7. Adding acid consumes some hydroxide ions and lowers the basicity, so the mixture approaches neutrality. Hence option A is correct. It did not become more basic, strongly acidic, or unchanged as the distractors claim.
Frequently asked questions
What is the correct answer to this question?
The solution became nearly neutral
Why is this the correct answer?
The governing concept is acid–base neutralisation shown through pH colour changes. Blue indicates a basic solution, whereas green is characteristic of a nearly neutral solution around pH 7. Adding acid consumes some hydroxide ions and lowers the basicity, so the mixture approaches neutrality. Hence option A is correct. It did not become more basic, strongly acidic, or unchanged as the distractors claim.
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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