2nd PUC Chemistry Series 6 December 3, 2020December 23, 2020wefru PUC Science 2nd Year Chemistry Series-6 quiz 8 Created on December 02, 2020 By wefru 2nd PUC Chemistry Series 6 TEST YOUR KNOWLEDGE OF SCIENCE 1 / 10 51. Helium is preferred to be used in balloons instead of hydrogen because it is incombustible lighter than hydrogen more abundant than hydrogen non polarizable 2 / 10 52. The increasing order of reducing power of the halogen acids is HF < HCl < HBr < HI HI < HBr < HCl < HF HBr < HCl < HF < HI HCl < HBr < HF < HI 3 / 10 53. Transistion metals, despite high E° oxidation, are poor reducing agents. The incorrect reason is high heat of vaporization. high ionization energies low heats of hydration complex forming nature 4 / 10 54. Which of the following has magnetic moment value of 5.9? Fe2+ Fe3+ Ni2+ Cu2+ 5 / 10 55. Anomalous electronic configuration in the 3d series are of Cr and Fe Cu and Zn Fe and Cu Cr and Cu 6 / 10 56. Which of the following are d-block elements but not regarded as transistion elements? Cu, Ag, Au Zn, Cd, Hg Fe, Co, Ni Ru, Rh, Pd 7 / 10 57. CuSO4. 5H2O is blue is colour because It contains water of crystallization. SO42- ions absorb red light. Cu2+ ions absorb orange red light. Cu2+ ions absorb all colours except red from the white light. 8 / 10 58. Transistion elements form alloys easily because they have Same atomic number Same electronic configuration Nearly same atomic size None of the above 9 / 10 59. Which one of the following characteristics of the transistion metals is associated with higher catalytic activity? High enthalpy of atomisation Paramagnetic behaviour Colour of hydrate ions Variable oxidation states 10 / 10 60. Which of the following has the maximum number of unpaired electrons? Mg2+ Ti3+ V3+ Fe2+ Your score isThe average score is 35% LinkedIn Facebook Twitter VKontakte 0% Restart quiz