[1] The geometry of a molecule is best described in terms of the locations of th

Question

[1] The geometry of a molecule is best described in terms of the locations of the atomic nuclei. What geometries are possible for compounds whose bonding can be described using sp2 hybrids orbitals? a. trigonal planar or bent b. tetrahedral, bent or trigonal planar c. square planar, tetrahedral, or trigonal planar d. trigonal bipyramidal or seesaw [2] In which of the following molecules or ions would the hybridization be sp3d? a. CoCl63- b. PCl6- c. PCl5 d. CO2 e. BF4 [3] The electron configuration for Mn2+ is: a. [Ar]4s23d3 b. [Ar]3d5 c. [Ar]4s13d5 d. [Ar]4s13d4 [4] Which set contains three isoelectronic species? a. Zn, Cd, Hg b. Br+, Kr, Rb c. P3-, Se2-, Ar d. F-, Na+, Mg2+ [5] What geometries are possible for compounds whose central atoms are sp3 hybridized? a. Trigonal planar or bent b. Tetrahedral, bent or trigonal pyramidal c. Square planar. tetrahedral, or trigonal planar d. Trigonal bipyramidal, or seesaw [6] The type of bond in LiCl (electronegative for Cl is 3.2) is a. pure ionic b. polar covalent c. nonpolar covalent d. ionic [7] The N2O molecule which has the Lewis Structure, :N (triple bond here) N-O: a. Linear, polar b. Bent, 120 c. Linear, nonpolar d. Bent, 109 [8] Which one of the following represents a possible excited electron configuration in which an electron has been promoted from the ground state to a higher level? a. 1s22s22p63s2 b. 1s22s22p63s13p1 c. 1s22s22p63s3 d. 1s22s22p52d13p2 e. 1s22s22p73s1 [9] What is the correct set of quantum numbers for the highest energy electron of Na? a. 3,0,0,+1/2 b. 3,1,0,+1/2 c. 3,1,-1,-1/2 d. 1,0,0,-1/2 [10] An atom of element X absorbs a photon and an electron is transferred from the ground state to a higher energy level. Which of the following represents such a transition? a. n = 2 to n = 4 b. n = 3 to n = 1 c. n = 1 to n = -5 d. n = 0 to n = 2

Explanation / Answer

a. trigonal planar or bent c.pcl5 a. [Ar]4s23d3 c. P3-, Se2-, Ar b. Tetrahedral, bent or trigonal pyramidal a. pure ionic b. Bent, 120 d. 1s22s22p52d13p2 a. 3,0,0,+1/2 d. n = 0 to n = 2

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