In acidic & alkaline solution amino acid exists as a -

Positive ion & negative ion respectively

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Negative ion & positive ions respectively

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Neutral in both medium

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None of these

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Solution

The correct option is D Positive ion & negative ion respectively
In acidic conditions, the amino acid acts as a base and accepts a proton at the amino group. This gives it a positive charge. In alkaline conditions, the amino acid acts as an acid and donates a proton from its carboxyl group. This gives it a negative charge.
So, the correct option is 'Positive ion & negative ion respectively'.

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