An example of weak acid is:

Give the appropriate term defined by the statement given below:

The substance that releases hydronium ion as the only positive ion when dissolved in water

Assertion: The amphoteric behaviour of water is explained by Lewis acid base theory

Reason: water acts as acid with ${\mathrm{NH}}_3$ and base with ${\mathrm{H}}_2\mathrm{S}$

What is an alkali? Do basic solutions also have ${\mathrm{H}}^{+}$(aq) ions? If yes, then why are these basic?