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  • The disperse phase in colloidal iron (III) hydroxide and colloidal gold is positively and negatively charged, respectively. Which of the following statements is NOT correct?<div class='qna-opti

The disperse phase in colloidal iron (III) hydroxide and colloidal gold is positively and negatively charged, respectively. Which of the following statements is NOT correct?

Option: 1

Magnesium chloride solution coagulates, the gold sol more readily than the iron (III) hydroxide sol


Option: 2

Sodium sulphate solution causes coagulation in both sols


Option: 3

Mixing of the sols has no effect


Option: 4

Coagulation in both sols can be brought about by electrophoresis


Answers (1)

best_answer

Coagulation or Precipitation

The stability of the lyophobic sols is due to the presence of charge on colloidal particles. If somehow the charge is removed the particles will come nearer to each other and settle down under gravity.

When oppositely charged sols are mixed together their charges are neutralized, they will come nearer to each other and settle down as precipitate.

Mixing of the sols has some effect.

Therefore, option number (3) is correct.

Posted by

Divya Prakash Singh

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