Question 5 — Manya is blindfolded. She is given - Questions at the end of the chapter - Chapter 2 Class 7 - Exploring Substances: Acidic, Basic, and Neutral

Last updated at August 16, 2026 by

Q5 (Medium): Manya is blindfolded. She is given two unknown solutions to test and determine whether they are acidic or basic. Which indicator should Manya use to test the solutions and why?

Answer:
We have studied that olfactory indicators change odour in acidic or basic medium. This is why Manya should use smell-based indicators.

  • Onion strips change odour in different solutions
  • Can smell the difference without seeing
  • Acidic solutions give different odour than basic
  • Litmus paper needs vision to see colour
Indicators for Blindfolded Testing Olfactory Indicators Use smell - perfect for blindfolded Onion Strips Change odour in acid/base Visual Indicators Need sight - not suitable
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