onion and vanila are _______ indicators...
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Olfactory indicators
Explanation:
Olfactory indicators are those indicators that change their odour when added to an acidic or a basic solution. Onion and vanilla are examples of olfactory indicators. The characteristic smell of an olfactory indicator is lost when it is added to a sodium hydroxide solution.
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Olfactory indicators
Olfactory indicator is a substance whose smell varies depending on whether it is mixed with an acidic or basic solution. Onion, clove oil and Vanilla extract are examples.
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