15. What elements are alloyed to make stainless steel? (A) Fe and C (B) Fe and Mn (C) Fe and Zn (D) Fe, V and Zn (E) Fe, Cr and Ni

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

15. What elements are alloyed to make stainless steel?
(A) Fe and C
(B) Fe and Mn
(C) Fe and Zn
(D) Fe, V and Zn
(E) Fe, Cr and Ni

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