Sarthaks Test
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Which of the following complexes formed by Cu2+ ions is most stable?

(i) Cu2+ + 4NH3  [Cu(NH3)4]2+, logK = 11.6

(ii) Cu2+ + 4CN  [Cu(CN)4]2–, logK = 27.3

(iii) Cu2+ + 2en  [Cu(en)2]2+, logK = 15.4

(iv) Cu2+ + 4H2 [Cu(H2O)4]2+, logK = 8.9

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(ii) Cu2+ + 4CN  [Cu(CN)4]2–, logK = 27.3

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