10. Predict the smallest actual bond angle in IBr3 using the VSEPR theory
(A) more than 120°
(B) exactly 120°
(C) between 109° and 120°
(D) between 90° and 109°
(E) less than 90°

11. Considering X-axis as the internuclear axis for N2, what kind of the molecular orbitals will be formed when ? (A) (B) (C) (D) (E)

12. When one mole of a real gas isothermally expands from 1 L to 2 L against a vacuum, which is the correct expression? (A) q = 0 and ΔS ＞ 0 (B) w = 0 and ΔU = 0 (C) w = 0 and ΔS = 0 (D) q = 0 and ΔS = 0 (E) w = 0 and ΔS ＞ 0 

13. Which is the correct description? (A) An atom with the electronic configuration [Kr] has one valence electrons. (B) Thallium is a transition metal atom. (C) are isoelectronic. (D) The effective nuclear charge can be larger than the actual nuclear charge Z. (E) Europium and californium belong to lanthanides.

14. Germanium crystallizes in a cubic lattice. The atomic mass and radius of a germanium atom are 72.6 g. and 123 pm respectively. The unit cell edge length is 566 pm. The density of germanium is 5.33 g.. How many germanium atoms are there in a unit cell? (A) 2 (B) 4 (C) 8 (D) 12 (E) 24

15. Consider the van der Waals coefficients in the following table, which molecule may have the strongest attractive intermolecular interactions? (A) Benzene (B) Ammonia (C) Chlorine (D) Diethyl ether (E) Water

16. Consider the following statements: a. Real gases act more like ideal gases as the pressure increases.  b. The Maxwell speed distribution graph for different molecules shows that heavier molecules travel with speeds close to their average values than the lighter ones.  c. At 1 atm and 273 K, every molecule in a sample of a gas has the same speed.  d. The kinetic model of gases states that gas particles move in ordered and non-random motions. e. At constant T, Xe molecules at 1 atm and He molecules at 5 atm both have the same average kinetic energy. Which of these statements are true? (A) a and d (B) b and e (C) a and e (D) b and e (E) a and c 

17. The melting points of the oxides of the third-period elements are given below. How many oxides are the molecular solids? Na2O (1275 °C), MgO (2800 °C), Al2O3 (2045 °C), SiO2 (1610 °C), P4O6 (23.8 °C), SO3 (16.8 °C), Cl2O7 (-91.5 °C) (A) 1 (B) 2 (C) 3 (D) 4 (E) There is no correct answer.

18. Which is the correct statement for the second law of thermodynamics? (A) In any cyclic process the entropy will either decrease or remain the same. (B) A system's entropy approaches a constant value as its temperature approaches absolute zero. (C) If two systems are in thermal equilibrium with a third system, then they are in thermal equilibrium with each other. (D) In a thermodynamic process involving a closed system, the increment in the internal energy is equal to the difference between the heat accumulated by the system and the work done by it. (E) It is impossible for a system to receive a given amount of heat from a high-temperature reservoir and provide an equal amount of work output.

19. A group of scientists recently synthesis a brand-new compound, named as Q. Please use the following thermodynamic data to estimate the boiling temperature of Q at P = 1 bar. Here are thermodynamic data of Q at 25 °C, and it is assumed that and S° are independent of temperature.  (A) 8442 K (B) 508.7 °C (C) 3818 K (D) 898.2 °C (E) There is not enough information.

20. According to the second law of thermodynamics, which is the correct expression for the spontaneous reaction? (A) ＞ 0 (B) ＞ 0 (C) /T ＞ 0 (D) + P·ΔV (E)

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