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JIPMER 2015
Exam
JIPMER
Year
2015
Subject
Chemistry
Chapter
Surface Chemistry

JIPMER 2015 · Chemistry · Surface Chemistry

In an experiment, addition of 4.0 mL of 0.005 M BaCl_2 to 16.0 mL...

In an experiment, addition of 4.0 mL of 0.005 M BaCl2\mathrm{BaCl}_2 to 16.0 mL of arsenious sulphide sol just causes complete coagulation in 2 h . The flocculating value of the effective ion is

Options

  1. ABa2+,1.0\mathrm{Ba}^{2+}, 1.0
  2. BBa2+,2.0\mathrm{Ba}^{2+}, 2.0
  3. CCl−,1.0\mathrm{Cl}^{-}, 1.0
  4. DCl−,2.0\mathrm{Cl}^{-}, 2.0

Correct answer

A. Ba2+,1.0\mathrm{Ba}^{2+}, 1.0

Step-by-step solution

As2 S3\mathrm{As}_2 \mathrm{~S}_3 sol is negatively charged owing to preferential adsorption of S2−\mathrm{S}^{2-} ions. Cation would be effective in causing coagulation. Flocculating value = minimum millimole of the effective ion per litre of sol =4×0.005(4+16)×10−3=1.0=\frac{4 \times 0.005}{(4+16) \times 10^{-3}}=1.0
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