Weak acids include which of the following?

(P) HF(aq)

(Q) HI(a.q)

(R) ${\mathrm{HNO}}_2\left(aq\right)$

The acids which are not completely dissociate in its constituent ions at the time of dissolved in solutions are called the weak acid.

Weak acids include Hydrogen fluoride, HF(aq) and Hydrogen iodide HI(a.q).