Q. Which one of the following will have highest coagulating power for ${As}_{2}S_{3}$ colloid?
A) ${Al}^{3 +}$
B) ${PO}_{4}^{3 -}$
C) ${SO}_{4}^{2 -}$
D) ${Na}^{+}$
Explanation
(a)
${As}_{2}S_{3}$solution is negatively charged colloidal solution. A positive ion will coagulate it. As coagulating power $\propto$ effective charge on ion.
Hence,${Al}^{3 +}$ ion will have highest coagulating power.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.