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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
At low temperature , `AlCl_3` exists as a close packed lattice of `Cl^-` ions with `Al^(3+)` ions occupying octahedral voids. Thus, `Al^(3+)` ions `Cl^-` ions around it . Hence, its coordination number is 6.
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