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31/10/2020 5:43 pm
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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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31/10/2020 5:43 pm
(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.