If an aqueous solution feels soapy and turns turmeric reddish-brown, what will be its nature?
Answer and explanation
Correct answer: Basic
A slippery or soapy feel is a common physical indication of a basic solution, although it should not be tested by touching unknown chemicals in practice. Turmeric is a natural indicator: it remains yellow in acidic or neutral conditions but turns reddish-brown in the presence of a base. Both observations point to alkalinity, so option B is correct. Acidic and neutral solutions do not produce this combined response, and being salt-free is not a measure of acid-base nature.
Frequently asked questions
What is the correct answer to this question?
Basic
Why is this the correct answer?
A slippery or soapy feel is a common physical indication of a basic solution, although it should not be tested by touching unknown chemicals in practice. Turmeric is a natural indicator: it remains yellow in acidic or neutral conditions but turns reddish-brown in the presence of a base. Both observations point to alkalinity, so option B is correct. Acidic and neutral solutions do not produce this combined response, and being salt-free is not a measure of 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.
