Q. In which of the following reactions colloids are not prepared by the double decomposition method?
A) $2H_{3}{AsO}_{4} + 3H_{2}S \rightarrow {As}_{2}S_{3} + 6H_{2}O$
B) $3K_{4}\left\lbrack Fe(CN)_{6} \right\rbrack + 4{FeCl}_{3} \rightarrow {Fe}_{4}\left\lbrack Fe(CN)_{6} \right\rbrack_{3} + 12KCl$
C) $Mg(CN)_{2} + H_{2}S \rightarrow HgS + 2HCN$
D) $Cu + {HgCl}_{2} \rightarrow {CuCl}_{2} + Hg$
Explanation
(d)
Colloidal solution of ${CuCl}_{2}$ is not prepared by double decomposition method
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.