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Q.

Which of the following colours does red cabbage extract turn when added to a base or alkali?


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a

Blue

b

Red

c

Yellow

d

Green 

answer is D.

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Detailed Solution

The red cabbage extract turns green when added to a base or alkali.
Indicators are used to detect the nature of acidic and basic solutions. Red cabbage extract is a natural indicator as it is derived from the leaves of red cabbage. In the presence of an acidic solution, the extract remains red and does not change in colour. In the presence of a basic solution, the extract turns green from red.
 
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