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 10^–7 and that of S²⁻ from HS^– ions is 1.2 10^–13 then the concentration of S²⁻ ions in aqueous solution is :
JEE Main 2018 · Session, Shift 1 · Q1318