A liquid X, when added to a substance Y, changes the colour of Y from orange to red. X is , while Y is a/an .

methyl orange

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red litmus solution

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acid

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red cabbage

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base

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Solution

The correct option is C acid
Liquid Y is orange in colour and turns red when X is added to it. This means that X is methyl orange indicator.
Methyl orange turns red in the acidic medium, while it turns yellow in the basic medium. So, X is an acid.

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