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AIIMS 2006
Exam
AIIMS
Year
2006
Subject
Chemistry
Chapter
Surface Chemistry

AIIMS 2006 · Chemistry · Surface Chemistry

Assertion : Fe^ 3+ can be used for coagulation of As_2 ~S_3 sol....

Assertion : Fe3+\mathrm{Fe}^{3+} can be used for coagulation of As2 S3\mathrm{As}_2 \mathrm{~S}_3 sol. Reason : Fe3+\mathrm{Fe}^{3+} reacts with As2 S3\mathrm{As}_2 \mathrm{~S}_3 to give Fe2 S3\mathrm{Fe}_2 \mathrm{~S}_3.

Options

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

Correct answer

C. If assertion is true, but reason is false

Step-by-step solution

When oppositely charged sols are mixed in almost equal proportions, their charges are neutralised. Both sols may be partially or completely precipitated. When negatively charged As2 S3\mathrm{As}_2 \mathrm{~S}_3 sol is added to positively charged Fe(OH)3\mathrm{Fe}(\mathrm{OH})_3 sol, in suitable amounts, precipitation of both the sols take place simultaneously.
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