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42. Para[CoCl]³- estimates the splitting energy of the octahedral crystalline field (Ao) in kJ/mol if the maximum absorption lambda is 740 nm. (h = 6.63 x10-³4 Js; c = 3.00 x 108 m/s) a) 0.162 kJ/mol b) 26.9 kJ/mol c) 0.0269 kJ/mol d) 162 kJ/mol 43. Alkali and alkaline earth metals are... a) little abundant in the earth's crust b) very reactive c) very uncommon in minerals d) highly electronegative 44. The periodic trend of explains the similarities between beryllium and aluminum, even if they are found in different families or groups. a) lanthanide contraction b) electronegativity c) electronic affinity d) diagonal relationships 45. One way to introduce alkali and alkaline earth metals into synthetic schemes is by dissolving them in ammonia. Diluted solutions of this type are colored a) green/paramagnetic b) dark blue / paramagnetic c) blue/diamagnetic d) green / diamagnetic 46. To stabilize the cations produced in ammonia solution, ligands such as: a) chlorine b) crypts c) water d) carbon monoxide 47. Grignard reagents have the general form: a) nBuli b) RMgX c) M*(NH3)n d) CaCO3 MgCO3

48. In the diagram of Ca(2-DMAMP)₂DME (Vargas, W.; Ruhlandt-Senge, K., Eur. J. Inorg. Chem. 2003, 3472) shown below, the chelate effect is observed and the metal has a coordination number of... NA Cat a) 3 b) 4 c) 6 d) 8 49. The "chelate effect" refers to... a) the great instability of complexes with multidented ligands b) the stability of complexes with multidentate ligands forming rings of 5 and 6 members c) how little favored is the coordination of thermodynamically multidented ligands d) how little favored is the coordination of multidentate ligands entropicamete 50. For the compound of Cu(II) shown below we can observe axial bonds with a length of 2.30 Å and equatorial bond lengths between 1.97 and 1.99 Å. This is awarded to CF3 V. Cui. F3C a) trans effect b) chelate effect c) closo effect d) Jan-Teller effect N1 CF3 Longitudes de enlace dadas en A