An amphoteric substance is

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A substance that can act as both acids and base by being both proton acceptor and proton donor.

A substance that acts as an acid by being both a proton acceptor and a proton donor

A substance that acts as a base being both a proton acceptor and a proton donor

When a hydronium ion from a base reacts with a hydroxide ion from an acid to make water and a salt E.A base that forms when an acid loses a proton.

answer is A.

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Detailed Solution

In this reaction we can clearly say that water itself acts as a proton donor and proton acceptor. So, it is an amphoteric substance. Thus, an amphoteric substance is a substance that can act as both acids and base by being both proton acceptor and proton donor.

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