IIT-JEE 2009 · Paper 2 · Chemistry Q18

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ChemistryInteger+4 / -1Question 18 of 57

The coordination number of Al in the crystalline state of $\ce{AlCl3}$ is

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Answer and worked solution

Official answer: 6

Crystalline $\ce{AlCl3}$ has a layer lattice in which each Al³⁺ sits in an octahedral hole surrounded by six chloride ions. (In the vapour it is the dimer $\ce{Al2Cl6}$ , with four-coordinate Al.)

Answer: 6

Topics:Group 13

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IIT-JEE 2009 · Paper 2, Chemistry question 18