Hydrogen gas is evolved when metals react with a base.
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Acids react with most metals to form a salt and hydrogen gas. ... For example, zinc metal reacts with hydrochloric acid producing zinc chloride and hydrogen gas. Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g). Bases react with certain metals like zinc or aluminum for example to also produce hydrogen gas.
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