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Q.

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

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a

${Cu}^{2 +} + 4 {NH}_{3} ⇌ {[Cu {({NH}_{3})}_{4}]}^{2 +}, logK = 11.6$

b

${Cu}^{2 +} + 4 {CN}^{-} ⇌ {[Cu (CN)_{4}]}^{2 -}, \log K = 27 .3$

c

${Cu}^{2 +} + 2 en ⇌ {[Cu (en)_{2}]}^{2 +}, \log K = 15 .4$

d

${Cu}^{2 +} + 4 H_{2} O ⇌ {[Cu {(H_{2} O)}_{4}]}^{2 +}, logK = 8 .9$

answer is B.

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Detailed Solution

Higher the value of stability constant K, greater is the stability. In the given examples, option (B) gives the reaction with the highest value of log K which in turn corresponds to the highest value of K. So [Cu(CN)₄]²⁻ is most stable out of given Cu²⁺ complexes.

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