44. What Group 6A elements are semiconductors?
(A) selenium and polonium
(B) tellurium and polonium
(C) sulfur and selenium
(D) selenium and tellurium
(E) sulfur and tellurium

37. What Group 6A elements are semiconductors? (A) selenium and polonium (B) sulfur and tellurium (C) sulfur and selenium (D) selenium and tellurium (E) tellurium and polonium

45. What is the molecular shape of XeF4? (A) tetrahedral (B) see-saw (C) T-shaped (D) square planar (E) none of these

46. How many of the following compounds exhibit geometric isomers? I: Pd(NH3)2Br2 (square planar) II: [Co(NH3)2]Cl3 III: [Ni(NH3)4(NO2)2] IV: K2[CoBr4] (A) 0 (B) 1 (C) 2 (D) 3 (E) 4

47. Give the number of geometric isomers for the octahedral compound [MA2B2C2], where A, B, and C represent ligands. (A) 1 (B) 2 (C) 3 (D) 5 (E) none of these

48. Which of the following statements is true about the octahedral complexes of ? (A) both strong- and weak-field complexes are diamagnetic (B) the strong-field complex is diamagnetic and the weak-field complex is paramagnetic (C) the strong-field complex is paramagnetic and the weak-field complex is diamagnetic (D) both strong- and weak-field complexes are paramagnetic (E) none of these

49. Calculate the total number of unpaired electrons in the following complex ions: , (square planar) and (strong field). (A) 0 (B) 1 (C) 2 (D) 3 (E) 4

50. Oxygen is stored in mammalian tissue in which type of molecule? (A) hemoglobin (B) myoglobin (C) chlorophyll (D) cytochrome (E) porphyrin

1. A car of mass 2000 kg, can reach a speed of 100 Km/h in 10 sec. What is the average power needed to accomplish this? (A) 103.6 hp, (B) 77.3 hp, (C) 103.6 kW, (D) 77.3 kW.

2. Ten bricks, each 10 cm thick and mass 1 kg, lie on a flat floor. How much work is required to stack them on top of one another? Assume the bricks have uniform density. (A) 40 J, (B) 44.1 J, (C) 49.5 J, (D) 55 J.

3. The moment of inertia of a solid sphere is 2MR²/5, hollow sphere is 2MR²/3, solid cylinder is MR²/2, and hollow cylinder is MR². All of the same mass M and the same outer radius R. If these four objects are released from rest at the top of an incline and start rolling without sliding. Which one will the last arrive at the bottom? (A) solid sphere, (B) hollow sphere, (C) solid cylinder, (D) hollow cylinder.

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