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Q.

Which of the following indicators is red in acid solution but blue in basic solution?


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a

Litmus

b

Methyl orange

c

Red cabbage extract

d

None of the above 

answer is A.

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Detailed Solution

Litmus paper turns red in acid and blue in base.
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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Which of the following indicators is red in acid solution but blue in basic solution?