Zn+H_(2)S... ZnS+H_(2) combustion double replacement single replacement synthesis

The given chemical equation is . In this reaction, zinc (Zn) replaces hydrogen in hydrogen sulfide (H_{2}S) to form zinc sulfide (ZnS) and hydrogen gas (H_{2}). This is a classic example of a single replacement reaction, where one element replaces another element in a compound. The general form of a single replacement reaction is , where element A replaces element B in the compound BC to form a new compound AC and release element B. In this case, A is Zn, BC is H_{2}S, AC is ZnS, and B is H_{2}. The other options provided, such as combustion, double replacement, and synthesis, do not accurately describe this reaction. Combustion involves a substance reacting with oxygen to produce heat and light, typically forming oxides. Double replacement reactions involve the exchange of ions between two compounds to form two new compounds. Synthesis reactions involve the combination of two or more simple substances to form a more complex compound. Therefore, the correct answer is "single replacement".