When zinc reacts with dilute HCl, the reaction can be classified as:
Displacement reaction
In the reaction Zn + 2HCl → ZnCl2 + H2, zinc, which is more reactive than hydrogen, takes the place of hydrogen in the acid. A more reactive element displacing a less reactive element from its compound is the defining feature of a displacement reaction.
A double decomposition (double displacement) reaction needs two compounds to exchange ions, but here one reactant (zinc) is a free element. A combination reaction is when two or more substances join to give a single product; here we obtain two products. Neutralisation requires an acid and a base; zinc is a metal, not a base, so this is not neutralisation either.
Hence, the answer is Displacement reaction.
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