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Q.

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


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a

Orange

b

Red

c

Yellow

d

Colourless 

answer is B.

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Detailed Solution

The methyl orange indicator turns red when added to a base or alkali.
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 to red from orange, whereas, in the presence of a base, the colour of methyl orange turns to yellow from orange.
 
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