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What are olfactory indicators ? Dry HCl ...

What are olfactory indicators ? Dry HCl gas does not change the colour of dry blur litmus. Give reasons.

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Olfactory indicatros are the substances which give different smells in acidic and basic solutions. For example, onion, vanilla and clove oil etc.
Since dry HCl does not ionise in water to release `H^(+)` ion, it fails to red. In other words, dry HCl does not behave as an acid.
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