30. Which of the following statements concerning gravimetric methods are INCORRECT?
(A) The particle size of a precipitate can be enhanced by minimizing the relative super-saturation during precipitate formation
(B) An electric double layer consists of the primary adsorption layer and counter-ion layer.
(C) Peptization is a process in which a precipitate is beated in the mother liquor.
(D) A gravimetric volatilization method is the classical method for the determination of hydrogen and carbon in organic compounds