In an acid-base reaction, if an indicator stops changing colour, what condition may it indicate?
Answer and explanation
Correct answer: A condition near neutralisation
An acid-base indicator changes colour over a particular pH transition range. During gradual addition of one solution to another, a stable final colour can indicate that the mixture has reached or passed the indicator’s endpoint, often near the neutralisation point in a suitable titration. It does not prove an explosion, absence of water, or metal formation. Therefore option C is the appropriate conclusion, with the exact pH depending on the indicator used.
Frequently asked questions
What is the correct answer to this question?
A condition near neutralisation
Why is this the correct answer?
An acid-base indicator changes colour over a particular pH transition range. During gradual addition of one solution to another, a stable final colour can indicate that the mixture has reached or passed the indicator’s endpoint, often near the neutralisation point in a suitable titration. It does not prove an explosion, absence of water, or metal formation. Therefore option C is the appropriate conclusion, with the exact pH depending on the indicator used.
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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