Match the complexes in List-I with their hybridisation in list-II.

List-I (Complex)		List-II (Hybridisation)
I	$$ \mathrm{Ni}(C O)_4 $$	A	$$ s p^3 d^2 $$
II	$$ \left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-} $$	B	$$ d^2 s p^3 $$
III	$$ \left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+} $$	C	$$ d s p^2 $$
IV	$$ \left[\mathrm{CoF}_6\right]^{3-} $$	D	$$ s p^3 $$

Cobalt (III) chloride forms a green coloured complex ' $X$ ' with $\mathrm{NH}_3$. Number of moles of AgCl formed when excess of $\mathrm{AgNO}_3$ solution is added to 100 mL of 1 M solution of ' $X$ ' is

Improve silver ore $+\mathrm{CN}^{-}+\mathrm{H}_2 \mathrm{O} \xrightarrow{\mathrm{O}_2}[\mathrm{X}]^{-}+\mathrm{OH}^{-}$

$$ [X]^{-}+\mathrm{Zn} \longrightarrow[Y]^{2-}+\mathrm{Ag} \text { (pure) } $$

The co-ordination numbers of the metals in $[X]$. [ $Y$ ] are respectively

How many of the following ligands are stronger than

$$ \begin{aligned} & \mathrm{H}_2 \mathrm{O} \text { ? } \\ & \mathrm{S}^{2-}, \mathrm{Br}^{-}, \mathrm{C}_2 \mathrm{O}_4^{2-}, \mathrm{CN}^{-} \text {, en, } \mathrm{NH}_3, \mathrm{CO}, \mathrm{OH}^{-} \\ & \begin{array}{ll} \text { } & \text { } \end{array} \end{aligned} $$