The conjugate acid of $HS^{-}$ is

Match the following species with their respective conjugate acids:

Species	Conjugate acid
$ (a) NH_{3} $	$ (i) H_{2}CO_{3} $
$ (b) HCO_{3}^{-} $	$ (ii) H_{3}O^{+} $
$ (c) H_{2}O $	$ (iii) NH_{4}^{+} $
$ (d) HSO_{4}^{-} $	$ (iv) H_{2}SO_{4} $

Which one of the following statements is correct?

Which of the following compounds accepts a proton from a water molecule according to the Bronsted-Lowry theory?

The number of species among the following that can act both as Bronsted acids and bases is $HCl, ClO_4^{-}, OH^{-}, H^{+}, H_2O, HSO_4^{-}, SO_4^{2-}, H_2SO_4, Cl^{-}$.

An amphoteric anion is capable of both accepting and donating a proton in a suitable medium. Which of the following ions exhibits this property?