21. Which of the following statements about quantum theory is incorrect?
(A) The energy and position of an electron cannot be determinedsimultaneously.
(B) Lower energy orbitals are filled with electrons before higher energyorbitals.
(C) When filling orbitals of equal energy, two electrons will occupy the sameorbital before filling a new orbital.
(D) No two electrons can have the same four quantum numbers.

27. Which of the following statements about quantum theory is incorrect? (A)The energy and position of an electron cannot be determined simultaneously. (B)Lower energy orbitals are filled with electrons before higher energy orbitals. (C)When filling orbitals of equal energy, two electrons will occupy the same orbital before filling a new orbital. (D)No two electrons can have the same four quantum numbers. (E)All of these are correct.

3. Which of the following statements about quantum theory is incorrect? (A) No two electrons can have the same four quantum numbers. (B) The energy and position of an electron cannot be determined simultaneously. (C) Lower energy orbitals are filled with electrons before higher energy orbitals. (D) When filling orbitals of equal energy, two electrons will occupy the same orbital before filling a new orbital. (E) All of these are correct.

22. The small, but important, energy differences between 3s, 3p, and 3d orbitalsare due mainly to (A) the penetration effect(B) their principal quantum number (C) the Heisenberguncertainty principle (D) the number of electrons they can hold

23. In the gaseous phase, which of the following diatomic molecules would be themost polar? (A) LiF (B) CsF (C) NaCl(D) CsCl

24. Which of the following has the smallest radius?(A) F- (B) Ne (C) O2- (D) Mg2+

25. How many species could have  bond(s) in the following? NO2- , NF3 , CO32- ,SO2 , CO2(A) 1 (B) 2 (C) 3 (D) 4

26. Which of the molecules does not obey the octet rule?(A) IV (B) III (C) II (D) I

27. How many of the molecules have dipole moment?(A) 1 (B) 2 (C) 3 (D) 4

28. How many of the molecule(s) have London dispersion force?(A) 1 (B) 2 (C) 3 (D) 4

29. The bond angles about the carbon atom in carbon dioxide are about:(A) 120° (B) 180° (C) 109° (D) 90°

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