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Which of the following statements is correct?
(A) Most four-coordinated complexes of \( \mathrm{Ni}^{2+} \) ions are square planar rather than tetrahedral.
(B) The \( \left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+} \) ion is more paramagnetic than the \( \left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-} \) ion.
(C) Square-planar complexes are more stable than octahedral complexes.
(D) The \( \left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{4-} \) ion is paramagnetic but \( \left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-} \) ion is diamagnetic.
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