Choose the odd one out of the following:

Vinegar

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Toothpaste

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Lemon

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Milk

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Solution

The correct option is B Toothpaste
Vinegar: Acetic acid

Toothpaste: Calcium fluoride (Base)

Lemon: Citric and Ascorbic acids

Milk: Lactic acid

So, vinegar, lemon and milk contain acid while toothpaste contains a base.

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