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Q. Which of the following is/are correct for olfactory indicators?
  1. Their colour changes with acid or base.
  2. Onion, vanilla or clove are examples.
Select the correct answer from the codes given below:
Answer: Only 2
Notes: There are some substances whose odour changes in acidic or basic media. These are called olfactory indicators. Olfactory indicators can be used in the laboratory to test whether a solution is a base or an acid, a process called olfactory titration. Onion, clove oil and vanilla extract are examples of olfactory indicators.
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