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.