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NEET2015ChemistrySurface ChemistryActual

Assertion: Fe ³⁺ can be used for coagulation of As ₂ ~S ₃ sol. Reason: Fe ³⁺ reacts with As ₂ ~S ₃ to give Fe ₂ ~S ₃ .

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion.
  2. BIfboth 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

Fe ³⁺ is positively charged whereas As ₂ ~S ₃ is negatively charged sol. Their charges are neutralised on mixing hence, mutual precipitation (coagulation) occurs.

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