10. Primary amine reacts with acetophenone to yield the
(A) iminium salt
(B) enamine
(C) azetal
(D) amide
(E) imine

11. The occupancy of body center cubic structure is: (A) 48.3% (B) 52.4% (C) 68.0% (D) 74.1% (E) 87.4%

12. Which symmetry element is not present in a methane molecule? (A) C2 (B) i (C) C3 (D) σd (E) S4

13. What is the coordination number of Co2+ in a spinel Co3O4 structure? (A) 4 (B) 6 (C) 8 (D) 12 (E) None of the above

14. In a two dimensional lattice, which one of the following indices corresponds to the smallest density of lattice points? (A) (10) (B) (13) (C) (21) (D) (11) (E) (41)

15. What is the point group of 1,3,5,7-tetrafluorocyclooctatetraene? (A) Td (B) Dth (C) S8 (D) C4v (E) S4

16. Which of the following theory model can explain that nitrogen gas is diamagnetic and molecular oxygen is paramagnetic? (A) VSEPR (B) Lewis structure (C) molecular orbital (D) Le Chatelier's principle (E) Ligand field theory

17. How many isomers of diamminediaquadichlorocobalt(III)? (A) 6 (B) 8 (C) 10 (D) 12 (E) 16

18. What is the incorrect statement regarding p-n junction? (A) Charges flow in both two directions. (B) No charge is available at the depletion zone while no external potential is applied. (C) Forward bias results in a current flow. (D) p-n junction can be used for photovoltaic cells. (E) All of the above

19. How many IR-active CO stretching bands for fac-Mo(CO)3(CH3CH2CH2CH2NH3)? (A) None (B) 1 (C) 2 (D) 3 (E) 4

20. Titanium dioxide (TiO2) is a well-known photosensitive semiconductor for various photocatalysis. What is the incorrect statement regarding TiO2 materials? (A) The band gap corresponds to UV-light absorption. (B) Generally considered as n-type semiconductor. (C) Increased life time of separated photo-charges in TiO2 results in weaker photocatalytic activities. (D) A white color material. (E) It has two phases of anatase and rutile stable in ambient conditions.

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