. d. 2 moles of Oxygen 42. The condensed sed electron configuration of Arsenic,
ID: 1034962 • Letter: #
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. d. 2 moles of Oxygen 42. The condensed sed electron configuration of Arsenic, element 33, is a. [Kr] 3d10 4s2 4p4 b. [Ar] 3d10 4s2 4p3 b. [Kr] 3d10 4s2 4p3 d. [Ar] 3d10 4s2 4p4 43. In the modern periodic table a. column is a group and rows are periods b. There are 18 groups and 7 periods C. Traversing down the group increases the atomic radius d. All of the above 44. Across a period a. Metallic Character increases b. Atomic radius increases c. lonization energy increases d. All of the above 45. Valence electrons a. exist in the outermost energy level of the atom b. Available for bonding c. Possess highest energy thus are very reactive d. All of the above 46. For main group elements that form ions with predictable charge a. Anionic charge is equal to group number plus two b. Cationic charge is equal to group number minus eight c. None of them d. Both of them 47. One of the following is not a property of halogens a. They are good oxidizing agents b. Very reactive c. React with metals to form salts d. lonization energy increases down the column 48. Electron affinity is defined as the a. Energy released when an electron is removed from the atom b. Energy absorbed when an electron is removed from the atom c. Energy transferred between two orbitals because of a change in atom d. Energy released when an electron is added to the atom 49.All of the following statements are correct except a. Structural formula communicates the most information b. Empirical formula gives the actual number of atoms each element. c. Molecular formula can be deduced from empirical formula d. The type of formula we use depends on how much we know about it. 50.Acids are molecular compounds that a. Release oxygen when dissolved in water b. Release hydrogen when dissolved in waterExplanation / Answer
42) ans is 'b' Since Arsenic atomic number is 33 then condensed electronic configuration is [Ar]3d104s2 4p3
43) ans is 'd'all the above since in modern periodic table coloumns are groups,rows are periods,there are 18 groups and 7 periods and down the group atomic radius increases.
44) ans is 'c' since Ionisation energy increases across a period due to increase in nuclear energy and decrease in atomic radius.
45) ans is 'd' all the above,because valency electrons exist in the outermost energy level of the atom,available for bonding,posses highest energy and thus they are very reactive.
46) ans is 'c' because anionic charge will be equal to group number minus eight from fifth group onwards whereas cationic charge will be equal to its group number,hence option a and option b are wrong.
47) ans is 'd' because for Halogens ionization energy decreses down the group.
48) ans is 'd' because electron affinity is defined as the energy released when an electron is added to neutral gaseous atom.
49) ans is 'b' because emperical formula gives the relative number of atoms of each element in a molecule but not actual number.
50) ans is 'b' because acids release hydrogen when dissolved in water according to Arrhenius theory.
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