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NTA Abhyas JEE Main2020ChemistrySurface ChemistryPractice

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?

Options

  1. AMagnesium chloride solution coagulates, the gold solution more readily than the iron (III) hydroxide solution
  2. BSodium sulphate solution causes coagulation in both the solutions
  3. CMixing of the solutions has no effect
  4. DCoagulation in both solutions can be brought about by electrophoresis

Correct answer

C. Mixing of the solutions has no effect

Step-by-step solution

Opposite charges attract each other. Hence on mixing, coagulation of two solutions may take place.

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