No, I did the same online quiz and CH3NH3+ is not correct. Weakest aicd will be least reactive, that means it will have larger concentration,
in this CH3NH3+ and NH3OH+ are functioning as acids, CH3NH3+ is 95%.
so the strongest acid should be NH3OH+
Respond to this Question
chemistry - Consider a buffer solution consisting of CH3NH3Cl and CH3NH2. Which ...