None of the ion is hydrolysing. — Ionic Equilibrium Chemistry Question

💡 Solution & Explanation

If none of the ions undergo hydrolysis, the solution behaves purely like pure neutral water. At $25^\circ\text{C}$, the concentration of hydronium ions in a neutral aqueous solution is governed solely by the autoionization of water, yielding $[\text{H}_3\text{O}^+] = 10^{-7}\text{ M}$. Therefore, correct answer is A.