Which of the following complexes formed by Cu²⁺ ions is
most stable?
(a) Cu²⁺ + 4NH₃ → [Cu(NH₃)₄]²⁺, log K = 11.6
(b) Cu²⁺ + 4CN⁻ → [Cu(CN)₄]²⁻, log K = 27.3
(c) Cu²⁺ + 2en → [Cu(en)₂]²⁺, lok K = 15.4
(d) Cu²⁺ + 4H₂O → [Cu(H₂O)₄]²⁺, log K = 8.9
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(B)
- Greater the value of log K, greater will be stability of complex compound formed.
- For reaction, Cu2++4CN−→[Cu(CN)4]2−
- K=[(Cu(CN)4)2−][Cu2+][CN−]4 and logK=27.3
- For this reaction, log K has highest value among the given four reactions.
- Hence, K will also be higher among these four. i.e., stability of the complexes will be highest among these four complexes.
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