Why is red cabbage juice useful as an indicator?
Answer and explanation
Correct answer: It shows different colors in acids and bases
The governing concept is indicator behaviour: an indicator changes colour according to whether the medium is acidic or basic. Red cabbage juice contains anthocyanin pigments whose molecular form changes with pH, so different colours appear in acidic, neutral, and basic solutions. Option A is therefore correct. The juice does not transform substances into gold or gas and is not restricted to testing metals.
Frequently asked questions
What is the correct answer to this question?
It shows different colors in acids and bases
Why is this the correct answer?
The governing concept is indicator behaviour: an indicator changes colour according to whether the medium is acidic or basic. Red cabbage juice contains anthocyanin pigments whose molecular form changes with pH, so different colours appear in acidic, neutral, and basic solutions. Option A is therefore correct. The juice does not transform substances into gold or gas and is not restricted to testing metals.
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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