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Select the CORRECT statements:
(a) The smaller the ligand, the closer it comes to the metal ion and thus the greater the repulsion between ligand and the electrons present in the d-orbital of central atom. That is why \( \mathrm{I}^{-}\mathrm{Br}^{-}\mathrm{Cl}^{-}\mathrm{F}^{-} \)are present in spectrochemical series.
(b) Aminoethanethiolate complex of \( \mathrm{Pt}(\mathrm{II}) \), \( \left[\mathrm{Pt}\left(\mathrm{NH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{~S}\right)_{2}\right] \) has no enantiomers but has geometrical isomers while aminoethanethiolate complex of cobalt (II), \( \left[\mathrm{Co}\left(\mathrm{NH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{~S}\right)_{2}\right] \), has no enantiomers and no geometrical isomers.
(c) \( \left.\left[\mathrm{Ni}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}\right] \) is green, \( \left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+} \) is deep blue \( \left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-} \) is yellow because \( \left[\mathrm{Ni}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+} \) absorb red colour, \( \left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+} \) absorb orange colour and \( \left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-} \) absorb violet indigo colour.
(d) \( \left[\mathrm{Fe}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{3}\right]^{3-} \) complex ion has \( \mathrm{d}^{2} \mathrm{sp}^{3} \) hybridisation, inner orbital complex and low spin
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