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Among the following molecules and ions, count how many involve the dz² orbital in their hybridisation: XeF4, ClF3, TeCl4, XeF5^(+), XeO4, XeO3F2, I3^(-), SF2, SnCl2.

1. 3
2. 4
3. 5
4. 6

Correct answer: 4

Solution

Species with sp³d (trigonal bipyramidal/seesaw/T-shape/linear with d) or sp³d² (octahedral/square planar with d) hybridisation use dz². Count gives 4.

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