To coagulate gelatin sol, which of the following electrolyte is most effective?

A
$KCl$
B
${AlCl}_{3}$
C
${Na}_{3} {PO}_{4}$
D
${Mg}_{3} {({PO}_{4})}_{2}$

Solution:

As Gelatin sol is $- ve$ sol in nature ${AlCl}_{3}$ has max. charge per cation $(+ 3)$ among other given electrolyte so ${AlCl}_{3}$ is most effective to coagulate gelatin sol.

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