Which salt is produced when NH sub 4 OH reacts with HNO sub 3 ?

This is a neutralization reaction: ammonium hydroxide reacts with nitric acid to form a salt and water. The salt is made from the ammonium ion (NH₄⁺) and the nitrate ion (NO₃⁻), giving NH₄NO₃, ammonium nitrate. Therefore, the correct choice is NH₄NO₃.

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