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Q.

Which of the following is an acid-base indicator?

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a

Vinegar

b

Baking soda 

c

Lime water

d

Turmeric

answer is C.

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Detailed Solution

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Indicators are substances that change colour to indicate whether a substance is acidic or basic.

Turmeric is also used as a natural indicator because its colour changes when an acid or base is present. 

Curcumin, the active ingredient in turmeric, is an acid-base indicator that appears yellow in acidic and neutral solutions and orange or reddish-brown in basic solutions

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