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NEET 2006
Exam
NEET
Year
2006
Subject
Chemistry
Chapter
Coordination Compounds

NEET 2006 · Chemistry · Coordination Compounds

Copper sulphate dissolves in excess of KCN to give:

Copper sulphate dissolves in excess of KCN\mathrm{KCN} to give:

Options

  1. ACu(CN)2\mathrm{Cu}(\mathrm{CN})_2
  2. BCuCN\mathrm{CuCN}
  3. C[Cu(CN)4]3−[\mathrm{Cu}(\mathrm{CN}) 4]^{3-}
  4. D[Cu(CN)4]2−\left[\mathrm{Cu}(\mathrm{CN})_4\right]^{2-}

Correct answer

C. [Cu(CN)4]3−[\mathrm{Cu}(\mathrm{CN}) 4]^{3-}

Step-by-step solution

CuSO4+2KCN→Cu(CN)2+K2SO4\mathrm{CuSO}_4+2 \mathrm{KCN} \rightarrow \mathrm{Cu}(\mathrm{CN})_2+\mathrm{K}_2 \mathrm{SO}_4 Cupric cyanide 2Cu(CN)2→2Cu(CN)+NC−CN Cyanogen Cu(CN)+3KCN→K3[Cu(CN)4]\begin{array}{r} 2 \mathrm{Cu}(\mathrm{CN})_2 \rightarrow 2 \mathrm{Cu}(\mathrm{CN})+\mathrm{NC}-\mathrm{CN} \\ \text{ Cyanogen } \\ \mathrm{Cu}(\mathrm{CN})+3 \mathrm{KCN} \rightarrow \mathrm{K}_3\left[\mathrm{Cu}(\mathrm{CN})_4\right] \end{array} Soluble complex salt
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