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Metal.

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Acid-base reactions always produce salt and water. Acids reacting with metals or carbonates can also produce hydrogen gas or carbon dioxide.
Updated On: May 19, 2025
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Solution and Explanation

When an acid reacts with a metal, a salt and hydrogen gas are produced. For example, when zinc (Zn) reacts with hydrochloric acid (HCl), zinc chloride (ZnCl2) and hydrogen gas (H2) are formed. The chemical equation is: \[ Zn (s) + 2HCl (aq) \rightarrow ZnCl_2 (aq) + H_2 (g) \]
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