Question

a metal which reacts with acid as well as base to form hydrogen gas​

Answer 1

Answer:

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.

Answer 2

Explanation:

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.