A solution has pH 7 and the universal indicator gives a light green colour. What nature does this indicate?
Answer and explanation
Correct answer: Neutral
The pH scale describes the acidic or basic character of an aqueous solution. At approximately 25°C, pH 7 represents neutrality, where hydrogen-ion and hydroxide-ion concentrations are approximately equal. Universal indicator normally appears green near neutral pH, so both pieces of evidence support option B. Highly acidic solutions have low pH and red or orange colours, whereas highly basic solutions have high pH and blue or violet colours; metallic is not an acid-base classification.
Frequently asked questions
What is the correct answer to this question?
Neutral
Why is this the correct answer?
The pH scale describes the acidic or basic character of an aqueous solution. At approximately 25°C, pH 7 represents neutrality, where hydrogen-ion and hydroxide-ion concentrations are approximately equal. Universal indicator normally appears green near neutral pH, so both pieces of evidence support option B. Highly acidic solutions have low pH and red or orange colours, whereas highly basic solutions have high pH and blue or violet colours; metallic is not an acid-base classification.
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.
