An aqueous solution of ammonia is a_____.

Strong acid

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Weak acid

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Strong Base

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Weak base

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Solution

The correct option is D
Weak base

Dry ammonia is a covalent molecule, so it is neutral even in liquefied form. Its aqueous solution is a weak base as the basicity is due to lone pair of electrons on its nitrogen atom. Ammonia is a typical weak base. Ammonia itself obviously doesn't contain hydroxide ions, but it reacts with water to produce ammonium ions and hydroxide ions.

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