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Question

The coordination number of Al in crystalline AlCl3 is

A
3
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B
6
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C
2
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D
1
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Solution

The correct option is B 6
In this structure, Al3+ exhibits octahedral geometry. Here each Al3+ is surrounded by 6Cl ions. So the coordination number will be 6.

In molten state, in exists as a dimer (Al2Cl6). The structure of crystalline AlCl3 is given here.

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