Final answer:
At 25 C, all of the given ionic compounds produce a basic aqueous solution except for NaHSO4 (sodium hydrogen sulfate).
Step-by-step explanation:
At 25 °C, all of the given ionic compounds produce a basic aqueous solution except for NaHSO₄ (sodium hydrogen sulfate). This is because NaHSO₄ is an acidic salt that undergoes hydrolysis in water, resulting in the formation of hydrogen ions (H+) and contributing to an acidic solution.