7. Which of the following statements is incorrect?
(A) NF3 is a polar molecule.
(B) The hybridization of the central atom is sp³ in ?
(C) According to the molecular orbital model, the bond order of P₂ molecule is three.
(D) A material is made from Al, Ga, and As. The mole fraction of each element is 0.25, 0.26, and 0.49, respectively. This material would be an p-type semiconductor.
(E) none of these

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