a metal which reacts with acid as well as base to form hydrogen gas
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When a metal reacts with a base it produces hydrogen and salt. Example - Sodium hydroxide gives hydrogen and sodium zincate when reacts with zinc metal. So, most of the metals react with acids and bases to produce hydrogen gas but not all metals.
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Amphoterism. In chemistry, an amphoteric compound is a molecule or ion that can react both as an acid and as a base. Many metals (such as copper, zinc, tin, lead, aluminium, and beryllium) form amphoteric oxides or hydroxides. Amphoterism depends on the oxidation states of the oxide.
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