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Which of the following is correctly matched?
(a) \( \left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{4-} \) and \( \left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-} \) - both are octahedral and diamagnetic with \( d^{2} s p^{3}- \)
\( P \) hybridisation
(b) \( \mathrm{Ni}(\mathrm{CO})_{4} \) and \( \left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-} \) - both are tetrahedral and diamagnetic with \( s p^{3} \)-hybridisation
W.
(c) \( \mathrm{Ni}(\mathrm{CO})_{4} \) and \( \left[\mathrm{Co}(\mathrm{CO})_{4}\right]^{-} \)- both are tetrahedral and diamagnetic
(d) \( \left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+} \) and \( \left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+} \) — both are paramagnetic and metal is \( d^{2} s p^{3} \)-hybridised
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