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Which of the following complexes formed by \( \mathrm{Cu}^{2+} \) ions is most stable?
(i) \( \mathrm{Cu}^{2+}+4 \mathrm{NH}_{3} \rightleftharpoons\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+} \),
\( \log \mathrm{K}=11.6 \)
\( \mathrm{P} \)
(ii) \( \mathrm{Cu}^{2+}+4 \mathrm{CN} \rightleftharpoons\left[\mathrm{Cu}(\mathrm{CN})_{4}\right]^{2-}, \quad \log \mathrm{K}=27.3 \)
(iii) \( \mathrm{Cu}^{2+}+2 \mathrm{en} \rightleftharpoons\left[\mathrm{Cu}(\mathrm{en})_{2}\right]^{2+} \), \( \operatorname{logK}=15.4 \)
W
(iv) \( \mathrm{Cu}^{2+}+4 \mathrm{H}_{2} \mathrm{O} \rightleftharpoons\left[\mathrm{Cu}\left(\mathrm{H}_{2} \mathrm{O}_{4}\right]^{2+}, \quad \operatorname{logK}=8.9\right. \)
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