14. When a weak acid is titrated with a strong base, the pH at the equivalence point? (A) is less than 7.0 (B) is equal to 7.0 (C) is greater than 7.0 (D) is equal to the pKa of the acid (E) none of these

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

14. When a weak acid is titrated with a strong base, the pH at the equivalence point?
(A) is less than 7.0
(B) is equal to 7.0
(C) is greater than 7.0
(D) is equal to the pKa of the acid
(E) none of these

相關試題

相關試卷