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(a) Define olfactory indicators. Name two substances which can be used as olfactory indicator. 

(b) Choose strong acids from the following: CH3COOH, H2SO4, H2CO3, HNO3

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(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.

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