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Q.

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.
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