Which of the following is a correct statement regarding coagulation?
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a
MgCl2 can coagulate As2S3 sol more readily than Al2O3.xH2O sol
b
MgCl2 can coagulate Al2O3.xH2O sol more readily than As2S3 sol
c
Coagulation power of MgCl2 remains the same whether added to As2S3 sol (or) Al2O3.xH2O sol
d
MgCl2 neither coagulates As2S3 sol nor coagulates Al2O3.xH2O sol
answer is A.
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Detailed Solution
As2S3 sol . . . Negative sol;Al2O3.xH2O sol . . . Positive sol;Mg+2 ion . . . Bivalent;Cl- ion . . . monovalent;∵ cation has higher valency, the electrolyte MgCl2 can coagulate negative sol more readily.