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JEE Advanced2006Chemistryd and f Block ElementsActual

CuSO ₄ decolourises on addition of KCN , the product is

Options

  1. A[ Cu ( CN )₄ ]²⁻
  2. BCu ²⁺ get reduced to form [ Cu ( CN )₄ ]³⁻
  3. CCu ( CN )₂
  4. DCuCN

Correct answer

D. CuCN

Step-by-step solution

CuSO ₄ decolourise on addition of KCN , the product is CuCN along with ( CN )₂ but in excess of KCN is form colourless potassium tetra cyano cuperate (I)

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