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4. d and f- block elements — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistry4. d and f- block elements1 Mark
MCQ
The colour of copper sulphide is
  • A
    Blue
  • ✓
    Black
  • C
    Red
  • D
    Green
✓

Answer

Correct option: B.
Black
b
Copper sulphide is black in colour. $Cu^{2+}$ is placed in $II$ group of inorganic qualitative analysis. It is precipitated in the form of sulphide by passing $H_2S$ in presence of dil. $HCl$.

$C{{u}^{2+}}\,+\,{{H}_{2}}S\,\to \,\underset{\text{black}}{\mathop{CuS}}\,\,+\,2{{H}^{+}}$

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