Question

what single displacement reaction is hydrochloric acid and zinc make?$HCl + Zn =ZnCl_{2} + H_{2}$

Answer 1

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A chemical reaction in which an atom or group of atoms present in a molecule is displaced by another atom is known as single displacement reaction.

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The single displacement reaction in which highly reactive element takes the position or place of less reactive element in a compound. The displacement reactions are very common in metals. Normally, a more reactive metal displaces less reactive metal present as its salt solution. The reaction is often known as metal displacement reaction.

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$2HCl(aq) + Zn(s) ----> ZnCl_{2}(aq) + H_{2}(g)$

Here, hydrogen is less reactive than zinc.

So, zinc displaces the atoms of hydrogen.