Question

The coordination number of Al in crystalline AlCl3 is A. 3 B. 6 C. 2 D. 1

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Answer

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The correct option is B. 6

In crystalline AlCl₃, the aluminum ion ($\mathrm{Al}^{3+}$) exhibits an octahedral geometry. This means that in its crystal structure, each $\mathrm{Al}^{3+}$ ion is surrounded by six chloride ions ($\mathrm{Cl}^{-}$). As a result, the coordination number of Al in crystalline AlCl₃ is 6.

Additionally, when AlCl₃ is in a molten state, it exists as a dimer, with the chemical formula $\left(\mathrm{Al}_{2}\mathrm{Cl}_{6}\right)$.


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