A solution giving blue colour with universal indicator turns green after acid is added. What does this mean?
Answer and explanation
Correct answer: The solution changed from basic to nearly neutral
The governing concept is the pH colour scale of a universal indicator. Blue generally represents a basic solution, while green is near neutral, around pH 7. When acid is added, hydrogen-ion concentration increases and the basic character is reduced. Thus the solution moves from basic toward neutral, making option A correct. Option B predicts the opposite change, and C would require a strongly acidic colour rather than green.
Frequently asked questions
What is the correct answer to this question?
The solution changed from basic to nearly neutral
Why is this the correct answer?
The governing concept is the pH colour scale of a universal indicator. Blue generally represents a basic solution, while green is near neutral, around pH 7. When acid is added, hydrogen-ion concentration increases and the basic character is reduced. Thus the solution moves from basic toward neutral, making option A correct. Option B predicts the opposite change, and C would require a strongly acidic colour rather than green.
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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