Q.

Which of the following colours is observed when a paste of turmeric is added to acid and base separately?

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a

Yellow in acid and red in base

b

Pink in acid and yellow in base

c

Red in acid and blue in base 

d

Yellow in both acid and base

answer is B.

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Detailed Solution

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Indicators are substances that show different colours in both acidic and basic mediums. Indicators are of two types: natural indicators and synthetic indicators. 

For example, turmeric is a natural indicator. It is yellow in colour when neutral. On adding its paste to acid, it gives yellow colour, while in the base, it gives red colour.

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