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BITSAT 2011
Exam
BITSAT
Year
2011
Subject
Chemistry
Chapter
Practical Chemistry

BITSAT 2011 · Chemistry · Practical Chemistry

H_ 2 S gas when passed through a solution of cations containing HCl...

H2S\mathrm{H}_{2} \mathrm{ S} gas when passed through a solution of cations containing HCl\mathrm{HCl} precipitates the cations of second group of qualitative analysis but not those belonging to the fourth group. It is because

Options

  1. Apresence of HC1 decreases the sulphide ion concentration.
  2. Bsolubility product of group II sulphides is more than that of group IV sulphides.
  3. Cpresence of HCl increases the sulphide ion concentration.
  4. Dsulphides of group IV cations are unstable in HC1\mathrm{HC} 1

Correct answer

A. presence of HC1 decreases the sulphide ion concentration.

Step-by-step solution

IV th ^{\text{th }} group needs higher S2−\mathrm{S}^{2-} ion concentration. In presence of HCl\mathrm{HCl}, the dissociation of H2 S\mathrm{H}_{2} \mathrm{~S} decreases hence produces less amount of sulphide ions due to common ion effect, thus HCl\mathrm{HCl} decreases the solubility of H2 S\mathrm{H}_{2} \mathrm{~S} which is sufficient to precipitate II nd ^{\text{nd }} group radicals.
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