The structures of \( \mathrm{Ni}(\mathrm{CO})_{4} \) and \( \mathrm{Ni}\left(\mathrm{PPh}_{3}\ri...

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The structures of \( \mathrm{Ni}(\mathrm{CO})_{4} \) and \( \mathrm{Ni}\left(\mathrm{PPh}_{3}\right)_{2} \mathrm{Cl}_{2} \) are
(A) square planar
(B) tetrahedral and square planar respectively
(C) tetrahedral
(D) square planar and tetrahedral respectively
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