Question

(a) Define olfactory indicators. Name two subtances which can be used as olfactory indicator.
(b) Choose strong acids from the following:
CH3COOH, H2SO4, H2CO3, HNO3

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Answer 1

Answer:

a Those substances whose smell odour changes in acidic or basic solution are called olfactory indicators e.g. onion and vanilla. b H2SO4 and HNO3 are strong acids.

Answer 2

Answer:

(a) Those substances whose smell (odour) changes in acidic or basic solution are called olfactory indicators, e.g. onion and vanilla.

(b) H2SO4 and HNO3 are strong acids.