Question

Which of the following complexes formed by Cu²⁺ ions is most stable?
(a) $Cu^{2+} + 4NH_3 \rightarrow [Cu(NH_3)_4]^{2+}$, log K = 11.6
(b) $Cu^{2+} + 4CN^- \rightarrow [Cu(CN)_4]^{2-}$, log K = 27.3
(c) $Cu^{2+} + 2en \rightarrow [Cu(en)_2]^{2+}$, lok K = 15.4
(d) $Cu^{2+} + 4H_2O \rightarrow [Cu(H_2O)_4]^{2+}$, log K = 8.9

Answer 1

A metal-containing ring like that shown is called a chelate ... more stable than the corresponding complexes of ... this increase in stability is called the chelate effect

d is correct answer

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Answer 2

Hello Friend

Ans

Option.D

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