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Assertion : Fe ( OH )₃ and As ₂ ~S ₃ colloidal sols on mixing precipitate. Reason : Fe ( OH )₃ and As ₂ ~S ₃ combine and form precipitate of new composition.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion.
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion.
  3. CIf assertion is true but reason is false.
  4. DIf both assertion and reason are false.

Correct answer

C. If assertion is true but reason is false.

Step-by-step solution

On mixing Fe ( OH )₃ (+ve sol) and As ₂ ~S ₃ (-ve sol), mutual coagulation occurs which causes precipitation. No new compound is formed.

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