NEET Chemistry Stability of Complexes MCQ Question with Solution

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⁺, log K = 15.4

D

Cu²⁺ + 4H₂O → [Cu(H₂O)₄]²⁺, log K = 8.9

Option B

The stability of a complex is indicated by its log K value. The complex with the highest log K value is the most stable, which is [Cu(CN)₄]²⁻.

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