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Q.

Which of the following colours does the litmus indicator turn when added to a base or alkali?


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a

Blue

b

Red

c

Yellow

d

Colourless 

answer is A.

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Detailed Solution

The litmus indicator turns blue when added to a base or alkali.
Indicators are used to detect the nature of acidic and basic solutions. Litmus is a natural indicator which is widely used in laboratories for the detection of acidic and basic properties. An acidic solution is detected if litmus paper turns red and a basic solution is detected when litmus paper turns blue.
 
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