Question

in the reaction zn + 2hcl → zncl₂ + h₂, zinc undergoes a reaction with hydrochloric acid. combination double replacement single replacement decomposition

Explanation:

To determine the reaction type, analyze the reaction \( \text{Zn} + 2\text{HCl}
ightarrow \text{ZnCl}_2 + \text{H}_2 \). In a single - replacement reaction, one element replaces another in a compound. Here, zinc (Zn) replaces hydrogen (H) in hydrochloric acid (HCl) to form zinc chloride (\( \text{ZnCl}_2 \)) and hydrogen gas (\( \text{H}_2 \)). A combination reaction involves two or more substances combining to form one product (not the case here). A double - replacement reaction involves the exchange of ions between two compounds (there are two reactants, but Zn is an element, not a compound with ions to exchange in the same way). A decomposition reaction involves a single compound breaking down into two or more substances (not the case here).

Answer:

single replacement