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The coordination number of Al in the cry...

The coordination number of `Al` in the crystalline state of `AlCl_(3)` is _____.

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The correct Answer is:
`(6)`
`AlCl_(3)` in acidified aqueous solution crystallises as octahedral `[Al(H_(2)O)_(6)]^(+3) Cl_(3)^(-3)`. In this complex, the `3d` orbitals of `Al` are involved and hybridisation state of `Al` is `sp^(2) d^(2)`. Hence, the coordination number of `Al` is six. It exits in `ccp` lattice with six coordinate layer structure.
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