Final answer:
In order for a reaction to produce gas, there should be a reactant that releases gas molecules. The reaction between HNO₃(aq) and MgCO₃(aq) would result in the formation of a gas, specifically carbon dioxide (CO₂).
Step-by-step explanation:
For a reaction to result in the formation of a gas, there must be a reactant that releases gas molecules. Looking at the given reactions:
a) Zn(s) + NaCl(aq) - This reaction involves a solid metal and an aqueous solution, and it does not produce any gas.
b) CH₃COOH(aq) + CuSO₄(aq) - This is a reaction between two aqueous solutions, and it does not result in the formation of a gas.
c) HNO₃(aq) + MgCO₃(aq) - This reaction involves an aqueous acid and an aqueous carbonate, and it produces carbon dioxide gas (CO₂) as one of the products.
Therefore, the correct answer is option c) HNO₃(aq) + MgCO₃(aq).