A student drops zinc into hydrochloric acid and a gas fizzes off. This reaction is a:

1. Zinc takes the place of hydrogen in hydrochloric acid, pushing the hydrogen out as a gas. 2. One element replacing another in a compound is a displacement reaction. 3. It is also a redox reaction, since zinc loses electrons and hydrogen gains them. 4. A combination reaction would take two reactants and give a single product, which is not what happens here. 5. Precipitation would form a solid, and decomposition would break one reactant into several products. _Source: NECTA CSEE 2021 Chemistry 032, Question 1: Multiple Choice, item (vi)_