試題詳解

24. A colloid is a mixture in which one substance consisting of microscopically dispersed insoluble particles is suspended throughout another substance. Which of the following statements about colloids is correct?
(A)A visible light beam is used to distinguish the solution from the colloid.
(B)H⁺, K⁺, S^2- , and B_r^- can coexist in large amounts in iron hydroxide colloids.
(C)Fe(OH)₃ colloid can be produced upon the dropwise addition of saturated FeCl₃(aq) to the concentrated ammonia.
(D)The hydrolysis of alum produces colloidal particles with adsorption, which can be used as bleaching agent.
(E)The specific surface area of soil colloidal particles is huge and generally positively charged, which can adsorb NH4⁺. and other ions and make the soil have fertilizer retention capacity.