H2S is passed into one dm3 of a solution containing 0.1 mole of Zn2 and 0.01 mole of Cu2 till the sulphide ion concentration reaches 8.1 ´10–19 moles. Which one of the following statements is true? [Ksp of ZnS and CuS are 3]´ a Both CuS and ZnS precipitate b Only ZnS precipitates c No precipitation occurs d Only CuS precipitates Both CuS and ZnS precipitate
