24. A colloid is a mixture in which one substance consisting of microscopicallydispersed insoluble particles is suspended throughout another substance. Which ofthe following statements about colloids is correct?
(A)A visible light beam is used to distinguish the solution from the colloid.
(B)H+, K+, S2- , and Br- can coexist in large amounts in iron hydroxide colloids.
(C)Fe(OH)3 colloid can be produced upon the dropwise addition of saturatedFeCl3(aq) to the concentrated ammonia.
(D)The hydrolysis of alum produces colloidal particles with adsorption, which canbe used as bleaching agent.
(E)The specific surface area of soil colloidal particles is huge and generallypositively charged, which can adsorb NH4+. and other ions and make the soil havefertilizer retention capacity.