1. Solution and colligative properties — Chemistry STD 12 Science — Question

$(i)$ $Co^{3+}$ (Octahedral complex with a strong field ligand)

$(ii)$ $Co^{3+}$  (Octahedral complex with a weak field ligand like $F^-$ )

$(iii)$ $Co^{2+}$  (Tetrahedral complex)

$(iv)$ $Co^{2+}$ (Square planar complex)

$Q + Cl ^{-} \rightarrow X$

$Q + Me _3 N \rightarrow Y$

$Q + CuCl _2 \rightarrow Z + CuCl$

$X$ is a monoanion having pyramidal geometry. Both $Y$ and $Z$ are neutral compounds. Choose the correct option($s$).

$(1)$ The central atoms in $X$ is $sp ^3$ hybridized

$(2)$ The oxidation state of the central atom in $Z$ is $+2$

$(3)$ The central atom in $Z$ has one lone pair of electrons

$(4)$ There is a coordinate bond in $Y$