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Q.

Which of the following colours does methyl orange turn when added to acid?


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a

Blue

b

Red

c

Yellow

d

Green 

answer is B.

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Detailed Solution

Methyl orange turns red when added to acid.
Indicators are used to detect the nature of acidic and basic solutions. Methyl orange is a synthetic indicator which is orange in colour when present neutrally. In the presence of an acid, the colour of methyl orange turns red from orange, whereas, in the presence of a base, the colour of methyl orange turns yellow from orange.
 
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