hydrochloric acid combing with zinc forms hydrogen gas
zinc_hydroxide is ionic_compound. hydrocyanic_acid is acid. hydrochloric_acid is chemical_compound. hydrochloric_acid is acid. zinc_hydroxide is crystal. hydrogen_gas is gas. zinc_hydroxide is inorganic_compound. zinc_hydroxide is electrolyte. hydroxy_acid is acid. zinc_hydroxide is chemical_compound.