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Q.
The coordination number of $Al$ in the crystalline state of $AlCl_{3}$ is ____
The p-Block Elements
Solution:
$AlCl_{3}$ in acidified aqueous solution crystallizes as octahedral $[Al(H_{2}O)_{6}]^{3+} Cl^{3-}_{3}$ In this complex, the $3d$ orbitals of $Al$ are involved and hybridization state of $Al$ is $sp^{3}\,d^{2}$ Hence, the coordination number of $Al$ is six. It exists in ccp lattice with six coordinate layer structure