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JEE Advanced 2006
Exam
JEE Advanced
Year
2006
Subject
Chemistry
Chapter
d and f Block Elements

JEE Advanced 2006 · Chemistry · d and f Block Elements

CuSO_4 decolourises on addition of KCN , the product is

CuSO4\mathrm{CuSO}_4 decolourises on addition of KCN\mathrm{KCN}, the product isCuSO_4 decolourises on addition of KCN , the product is

Options

  1. A[Cu(CN)4]2−\left[\mathrm{Cu}(\mathrm{CN})_4\right]^{2-}
  2. BCu2+\mathrm{Cu}^{2+} get reduced to form [Cu(CN)4]3−\left[\mathrm{Cu}(\mathrm{CN})_4\right]^{3-}
  3. CCu(CN)2\mathrm{Cu}(\mathrm{CN})_2
  4. DCuCN\mathrm{CuCN}

Correct answer

D. CuCN\mathrm{CuCN}

Step-by-step solution

CuSO4\mathrm{CuSO}_4 decolourise on addition of KCN\mathrm{KCN}, the product is CuCN\mathrm{CuCN} along with (CN)2(\mathrm{CN})_2 but in excess of KCN is form colourless potassium tetra cyano cuperate (I) CuSO_4 decolourises on addition of KCN , the product is
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