Which type of reaction occurs between $H_{2}SO_{4}$ and $HNO_{3}$ in nitration?

If $pK_b$ for fluoride ion $(F^-)$ at $25\,^{\circ}C$ is $10.83$,the ionisation constant $(K_a)$ of hydrofluoric acid $(HF)$ in water at this temperature is:

$Cl^{-}$ is the conjugate base of

Complete the following Acid-Base reactions and identify each reactant as an Acid or a Base:
$(i)$ $CH_3NH_2 + H_2O$
$(ii)$ $CO_2 + H_2O$
$(iii)$ $H_2PO_4^- + CO_3^{2-}$
$(iv)$ $NH_2NH_2 + H_2O$
$(v)$ $C_6H_6 + NO_2^+$
$(vi)$ $C_6H_6 + NH_2^-$

Which of the following is the most basic?

What is the enthalpy change in $kJ$ when $1$ gram-equivalent of a strong base reacts with an excess of a strong acid?