Turmeric becomes reddish-brown and phenolphthalein becomes pink in a solution. What is the nature of the solution?
Answer and explanation
Correct answer: Basic
Indicators change colour in characteristic media. Turmeric turns reddish-brown in the presence of a base, and phenolphthalein becomes pink in a basic solution, generally when the pH is above its transition range. Since both independent observations indicate alkalinity, the solution is basic. Option B is correct. An acidic solution would not produce this combination of colours, and neutral or metallic are not suitable descriptions of the solution’s acid–base nature.
Frequently asked questions
What is the correct answer to this question?
Basic
Why is this the correct answer?
Indicators change colour in characteristic media. Turmeric turns reddish-brown in the presence of a base, and phenolphthalein becomes pink in a basic solution, generally when the pH is above its transition range. Since both independent observations indicate alkalinity, the solution is basic. Option B is correct. An acidic solution would not produce this combination of colours, and neutral or metallic are not suitable descriptions of the solution’s acid–base nature.
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.
