When universal indicator is added to a solution, the colour appears green. What is the nature of the solution?
Answer and explanation
Correct answer: Neutral
The governing concept is the colour scale of a universal indicator. It displays different colours over a range of pH values: acidic solutions are generally red to orange, strongly basic solutions are blue to violet, and green is associated with a pH close to 7. Thus the observed green colour indicates that the solution is approximately neutral. It does not prove that the solution is metallic or strongly acidic/basic, so option B is correct.
Frequently asked questions
What is the correct answer to this question?
Neutral
Why is this the correct answer?
The governing concept is the colour scale of a universal indicator. It displays different colours over a range of pH values: acidic solutions are generally red to orange, strongly basic solutions are blue to violet, and green is associated with a pH close to 7. Thus the observed green colour indicates that the solution is approximately neutral. It does not prove that the solution is metallic or strongly acidic/basic, so option B 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.
