Question

A visually challenged student, has to perform a lab test to detect the
presence of acid in a given solution. The acid-base indicator preferred by
him will be
Ble litmus
c) Red cabbage extract
(d) Hibiscus extract​

Answer 1

Explanation:

he has to use olfactory indicators eg onion,vanilla essence,clove oil etc this will helps him to detect the smell

Answer 2

The acid-base indicator preferred by a visually challenged student is (b) clove oil.

• In an acid-base titration or any reactions involving acid and base, use of an indicator is necessary because visually, the naked eye cannot detect any difference between an acid and a base. HCl and NaOH both appear as colorless liquids.
• Usually, litmus paper is used to detect the presence of acid in a solution. Acid turns blue litmus paper red and a base turns red litmus paper blue.
• Olfactory indicators may also be used for detection and clove oil is one such example through which, presence of acid can be detected through smell.
• Clove oil loses its smell in basic solution and retain it in acidic solution.
• Hence, it can be used by a visually challenged student.