The substance which will change the colour of red cabbage solution to dark green is

Vinegar

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Curd

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Soap

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Lemon

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Solution

The correct option is C
Soap

Red cabbage is a visual indicator which changes its colour in acidic or basic media. It gives dark green colour in basic media and pink colour in acidic media. Vinegar contains acetic acid, curd contains lactic acid and lemon contains citric acid. All these will change the colour of the red cabbage solution to pink. Soap is basic in nature as it contains sodium hydroxide. It will change the colour of the red cabbage solution to dark green.

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