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D and F Block Elements question

2006 · Q87
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D and F Block Elements question

2006 · Q87

NEETChemistryD and F Block ElementsMCQ+4 / −1
Copper sulphate dissolves in excess of KCN to give
  1. A
    Cu(CN)2
  2. B
    CuCN
  3. C
    [Cu(CN)4]3−-−
  4. D
    [Cu(CN)4]2−-−
View written solutionFree

Correct answer: C

Copper sulphate on treatment with excess of KCN forms complex K3[Cu(CN)4] or [Cu(CN)4]3–

2CuSO4 + 10KCN →\to→ 2K3[Cu(CN)4]

  • 2K2SO4 + (CN)2
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