Which of the following is an amphoteric acid?

Glycine

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Salicylic acid

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Benzoic acid

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Citric acid

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Solution

The correct option is A Glycine
Glycine $H_{2} N - C H_{2} - C O O H$ is an amphoteric acid. It contains basic amino group that reacts with acids. It also contains acidic carboxylic group which reacts with bases.

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