In α-WCl6 …

Q: In α-WCl6

(A) all Cl ions are present in cubic close packing

(B) W occupies, 1/6th of the octahedral holes.

(C) W occupies 1/3rd of the tetrahedral holes.

(D) All Cl ions are present in all octahedral

Solution: In α-WCl6, Cl ions are arranged in cubic close packing, so, there is only one Cl–ion in 1-unit cell. So, the formula can be written W1/6Cl, i.e. 1/6  of the octahedral hole is filled by W.

Ans: (A), (B)