Final answer:
The electrolysis of aqueous salts can produce hydrogen gas and oxygen gas, such as in the case of NaCl.
Step-by-step explanation:
The electrolysis of aqueous salts can produce hydrogen gas and oxygen gas. For example, when sodium chloride (NaCl) is electrolyzed, hydrogen gas and chlorine gas are produced:
2NaCl(aq) + 2H₂O(1) → 2NaOH(aq) + H₂(g) + Cl₂ (g)
This means that out of the given options, the aqueous salt that will produce hydrogen gas and oxygen gas through electrolysis is NaCl.