Four species are listed below:(i) ${\text{HCO}}_3^{-}$ (ii) ${\text{H}}_3{\text{O}}^{+}$ (iii) ${\text{HSO}}_4^{-}$ (iv) ${\text{HSO}}_3\text{F}$ Which one of the following is the correct sequence of their acid strength?

Acid strength depends on the stability of the conjugate base and the electronegativity of the central atom.${\text{HSO}}_3\text{F}$ (Fluorosulphuric acid) is a superacid, much stronger than mineral acids.${\text{H}}_3{\text{O}}^{+}$ is the characteristic acid species in water.${\text{HSO}}_4^{-}$ is the conjugate base of a strong acid (${\text{H}}_2{\text{SO}}_4$) but is itself a weak acid.${\text{HCO}}_3^{-}$ is the conjugate base of a weak acid (${\text{H}}_2{\text{CO}}_3$) and is very weakly acidic.Sequence: ${\text{HCO}}_3^{-}<{\text{HSO}}_4^{-}<{\text{H}}_3{\text{O}}^{+}<{\text{HSO}}_3\text{F}$.