__________ is used to measure the strength of acid or base.

Turmeric

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Red cabbage

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Litmus

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Onion

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Solution

The correct option is A Red cabbage
Red cabbage is a universal indicator. Universal indicator is a combination of many indicators. It not only determines the nature of acid or base but also gives the strength of the given solution. Other indicators like natural, olfactory do not determine the strength of the acid or base.

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