١٤ 5. Based on electronegativity differences, which of the following is most likely to be ionic? a) b) BaF2 Br2 c) PH3 d) NO₂ e) CL How many electrons can be contained in all of the orbitals with n = 4? a) 2 b) 8 c) 10 d) 18 e) 32 Which of the following molecules has no dipole moment? 7. CO₂ b) NH3 H₂O all none 8. How many electrons can be described by the quantum numbers n=2, 1-2, mi=1? a) 0 b) 2 c) 6 d) 10 e) 14 9. Which of the following combinations of quantum numbers is not allowed? a) n=1,1-1, mi=0,m,= % b) n=3,1-0, mi=0,m,=-% c) n=2,1-1, my=-1, m, % d) n=4,1-3, my=-2, m,--% e) n=4,1-2, mi=0,m,= % 10. Which of the following arrangements is in order of increasing size? a) Ga³>Ca2+>K>Cr>S b) S>Cr>K+> Ca² > Ga³ c) Ga³> 82-> Ca² > Cr>K d) Ga>Ca2+ > S²-> Cr> K e) Ga> Ca2+> S²-> K+> Cr 11. What is the complete electron configuration of antimony? a) 1s 2s 2p 3s3p4 d4p5s4d5d5p³ b) 1s 2s 2p 3s Ap c) 1s 2s 2p 3s3p 24d5dSp³ d) 1s 2s 2p 3s3p4s2 5524d5p e) none of these 12. In which group do all the elements have the same number of valence electrons? a) P, S, CI b) Ag, Cd, Ar c) Na, Ca, Ba d) P, As, Se e) none of these 13. Which of the following electron configurations is correct? a) Ga: [Kr]4s23d4p¹ b) Mo: [Kr]5s24d c) Ca: [Ar]4s 3d0 d) Br. [Kr]4s3d4p e) Bi: [Xe6s2445d06p³ 14. Which of the following is listing the following atoms in order of increasing ionization energy: Li, Na, C, O, F. a) Li<Na<C<O<F b) Na<Li<C<0<F c) F<O<C<Li <Na d) Na<Li<F<O<C e) Na<Li<C<F<O Dell sol 15. Which of these has larger atomic radius, Fe2+ or Fe3+ a) Fe2+ b) Fe³+ c) same size d) impossible to tell 16. Which of the following groups contains no ionic compounds? a) HCN, NO2, Ca(NO3)2 b) PCls, LiBr, Zn(OH)2 c) KOH, CCl4, SF4 d) NaH, CaF2, NaNH2 e) CH₂O, H2S, NH3 17. Atoms having equal or nearly equal electronegativities are expected to form a) no bonds polar covalent bonds nonpolar covalent bonds b) c) d) ionic bonds e) covalent bonds 18. Using the following bond energies: Bond C=C C-H 0=0 C=O O-H Bond Energy (kJ/mol) 839 413 495 799 467 estimate the heat of combustion for one mole of acetylene: C2H2(g) + O2(g) →2CO2(g) + H2O(g) 1228 kJ b) -1228 kJ c) -447 kJ d) +447 kJ e) +365 kJ 19. What is the correct molecular structure for H₂O a) linear b) trigonal planar c) tetrahedral d) bent e) none of these >0>0 20. What is the hybridization of Al in AlBry? a) sp b) sp² c) sp³ d) dsp³ of sp³ 21. What is the hybridization of Se in SeF6? a) sp b) sp² d) dsp³ e) d'sp³ 22. What is the molecular geometry of NH3 ? linear b) trigonal pyramidal c) bent d) tetrahedral e) none of these 23 What is the molecular geometry of NH4*? a) linear b) trigonal pyramidal c) bent d) tetrahedral e) none of these 24. Which of the following electron configurations is correct? Ga: [Kr]4s23d04pl b) Mo: [Kr]5s24d c) Ca: [Ar]4s'3d10 d) Br: [Kr]4s3d4p e) Bi: [Xe]64/44563 25. Which of the following have 10 electrons in the d orbitals? Mn a) b) Fe c) Cu d) Zn e) two of the above 26. Which of the following bonds would be the least polar, yet still be considered polar covalent? a) Mg-O b) C-O c) 0-0 d) Si-O N-O 27. Which of the following has the smallest radius? a) K* b) Cr c) Rb* d) e) Ar 28. What is the molecular geometry of PF3? a) linear b) trigonal pyramidal c) bent d) tetrahedral e) trigonal bipyramidal 29. What is the hybridization state of the central atom in PBr3 molecule? a) sp b) sp² c) sp³ d) dsp³ e) of sp³ 30. Which element atom has the electron configuration of [Xe]6s24f45d106p4? a) Bi b) Rn c) Th d) Kr e) none of these