An aqueous solution contains 0.10 M H₂S and 0.20 M HCl. If the equilibrium constants for the formation of HS^– from H₂S is 1.0 $$\times$$ 10^–7 and that of S^2- from HS^– ions is 1.2 $$\times$$ 10^–13 then the concentration of S^2- ions in aqueous solution is :

An alkali is titrated against an acid with methyl orange as indicator, which of the following is a correct combination?

Which of the following salts is the most basic in aqueous solution?

Which of the following are Lewis acids?