Q. The number of moles of lead nitrate needed to coagulate 2 moles of colloidal [AgI]$I^{-}$ is
A) 2
B) 1
C) 1/2
D) 2/3
Explanation
(b)
In lead nitrate, lead is present as ${Pb}^{2 +}$ ion. While there is only on negative ion per mole of colloid. Hence, one mole ${Pb}^{2 +}$ can coagulate two moles of $\lbrack AgI\rbrack I^{-}.$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.