Which of the following set of substances contain acids only?
A
Grapes, lime water
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B
Vinegar, soap
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C
Curd, milk of magnesia
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D
Curd, vinegar
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Solution
The correct option is D Curd, vinegar
Curd contains lactic acid and vinegar contains acetic acid. Lime water, soap, and milk of magnesia are basic substances and grapes contain tartaric acid.