The reactants of the reaction of single replacement that produces ZnCl₂ and H₂ is Zn + 2HCl
Step-by-step explanation
In a single replacement reaction is a chemical reaction whereby an element react with compound and take the place of another element in that compound.
zn displaces H from HCl to form ZnCl₂ and H₂ according to below equation.
Zn +2HCl → ZnCl₂ + H₂