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CGP EDU Academic Team
Published on: August 13, 2026
Aqueous CuSO 4 decolorizes on addition of excess KCN due to formation of complex
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20
Sol. Aq.CuSO 4 (blue ) + KCN 
Cu(CN) 2 ↓ + K 2 SO 4
Cu(CN) 2 ↓ 
CuCN ↓ + (CN) 2
CuCN ↓ + CN – 
[Cu(CN) 4 ] 3– (colourless soluble complex)
A = [Cu(CN) 4 ] 3– (colourless soluble complex)
a = 0 (sp 3 ); c = 4
8a + 5c = 20
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