COMEDK2024ChemistryCoordination Compounds
Observe the given below reaction. Aqueous CuSO ₄ Excess a q KCN A H ₂ ~S B A, B respectively are
Options
- AK ₃ [ Cu ( CN )₄ ] , no precipitate
- BK ₂ [ Cu ( CN )₄ ] , no precipitate
- CK ₄ [ Cu ( CN )₆ ] , white ppt.
- DK ₂ [ Cu ( CN )₄ ] , black precipitate
Correct answer
A. K ₃ [ Cu ( CN )₄ ] , no precipitate
Step-by-step solution
The complete reaction is as follow. As CN ⁻ is a strong ligand, the complex formed is highly stable and does not dissociate to give Cu ⁺ ions. However, no precipitate of CuS is formed when H ₂ ~S gas is passes through solution.