Question

Explain the process of preparation of olfactory indicators using onion and a clean cloth​

Answer 1

Answer:

Olfactory indicators are prepared by taking onion juice and a piece of cloth and dipping the cloth in the juice . Explanation: when this cloth is dipped in a base like NAOH the characteristic smell of onion is not detected while when the cloth is dipped in an acid like HCL the characteristic smell of onion is detected.