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Organic Chemistry: Some Basic Principles and Techniques — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryOrganic Chemistry: Some Basic Principles and Techniques1 Mark
MCQ
Yellow ammonium sulphide can separate:
  • ✓
    $\ce{CdS}$ and $\mathrm{As}_2 \mathrm{S}_3$
  • B
    $\mathrm{Bi}_2 \mathrm{S}_3$ and $\ce{CuS}$
     
  • C
    $\ce{PbS}$ and $\mathrm{Bi}_2 \mathrm{S}_3$
     
  • D
    $\ce{HgS}$ and $\ce{PbS}$
✓

Answer

Correct option: A.
$\ce{CdS}$ and $\mathrm{As}_2 \mathrm{S}_3$
Since $\ce{CdS}$ belongs to $\ce{IIA}$ group and $\mathrm{As}_2 \mathrm{S}_3$​ belongs to $\ce{IIB}$ group, they can be separated with yellow ammonium sulphide as only $\ce{IIB}$ group sulphides dissolve in yellow ammoium sulphide.

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