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AIIMS 201826 May
Exam
AIIMS
Year
2018
Date
26 May
Subject
Chemistry
Chapter
Surface Chemistry

AIIMS 2018 · 26 May · Chemistry · Surface Chemistry

Assertion : Fe(OH)_3 and As_2 ~S_3 colloidal sols on mixing...

Assertion : Fe(OH)3\mathrm{Fe}(\mathrm{OH})_3 and As2 S3\mathrm{As}_2 \mathrm{~S}_3 colloidal sols on mixing precipitate. Reason : Fe(OH)3\mathrm{Fe}(\mathrm{OH})_3 and As2 S3\mathrm{As}_2 \mathrm{~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\mathrm{Fe}(\mathrm{OH})_3 (+ve sol)andAs2 S3and \mathrm{As}_2 \mathrm{~S}_3 (-ve sol), mutual coagulation occurs which causes precipitation. No new compound is formed.
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