The hybridisation and geometry of the complex $\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}$ are

Match List-I with List-II for oxidation number of central metal atom.

$$ \begin{array}{llcc} \hline \begin{array}{c} \text { List-I } \\ (\text { Complex }) \end{array} & & \begin{array}{c} \text { List-II } \\ \text { (Oxidation number) } \end{array} \\ \hline \text { A. } \mathrm{Ni}(\mathrm{CO})_4 & \text { I. } & +1 \\ \hline \text { B. }\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_5 \mathrm{NO}\right]^{2+} & \text { II. } & \text { Zero } \\ \hline \begin{array}{l} \text { C. }\left[\mathrm{Co}(\mathrm{CO})_5\right]^{2-} \\ (\mathrm{Each} \mathrm{Cr}) \end{array} & \text { III. } & -1 \\ \hline \begin{array}{l} \text { D. }\left[\mathrm{Cr}(\mathrm{CO})_{10}\right]^{2-} \\ (\mathrm{Each}) \end{array} & \text { IV. } & -2 \\ \hline \end{array} $$

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Hybridisation and geometry of $ \left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-} $ are

Match List I with List II.

List I $($ Complex)	List II (Oxidation number of metal)
A. $\mathrm{Ni}(\mathrm{CO})_4$	I. +1
B. $\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_5 \mathrm{NO}\right]^{2+}$	II. Zero
C. $\left[\mathrm{Co}(\mathrm{CO})_5\right]^{2-}$	III. -1
D. $\left[\mathrm{Cr}_2(\mathrm{CO})_{10}\right]^{2-}$	IV. -2

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