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21) Which combination of hybrid orbital descriptions and electronic geometry descriptions is INCORRECT? A) sp/linear B) sp2/trigonal planar C) sp3/tetrahedral D) sp3d/square planar E) sp3d2/octahedral 22) Which hybrid orbitals are impossible in electrically neutral molecules containing only the elements shown? A) sp3/Al and H B) sp2/B and F C) sp/C and H D) sp2/N and O E) sp3/O and F 23) Three of the molecular shapes which a sp3d hybridized molecule can have are: A) triangular, trigonal bipyramid, linear B) linear, square planar, T-shaped C) irregular tetrahedron, T-shaped, bent D) T-shaped, linear, trigonal bipyramid E) linear, tetragonal pyramid, octahedral 24) For BeCl2, the dipole moment of the molecule, hybridization on the central atom, and number of lone pairs on the central atom are: A) toward Be, sp2, none B) away from Be, sp2, one C) none, sp, none D) toward Be, sp, one E) none, sp3, two 25) For the molecule A) the hybridization for C is sp3 B) the hybridization for N is sp2 C) the hybridization for O is sp3 D) N is not hybridized E) the hybridization for C is sp2 26) Which of the pairs of molecules below have the same hybridization on the central atom? (The central atom is underlined in each molecule.) A) CO2, CH4 B) H2CO, BeH2 C) BCl3, HNO D) H2O, HF E) NH3, HNO 27) Find the correct statements about the bonding in methane, CH4. I)The carbon s and p orbitals combine to form four equivalent sp3 orbitals II) All C-H bonds have the same strength III) Molecular geometry is different from electron group geometry IV) Four C sp3 orbitals combine with the s orbitals of the hydrogens to form bonds A) I), II), III) B) I), II), IV) C) II), III), IV) D) I), III) IV) E) I), II) 28) Choose the INCORRECT statement about PCl5. A) There are no π bonds. B) P has one lone pair. C) P has sp3d hybridization. D) Each Cl has 3 lone pairs. E) There are 5 σ bonds. 29) Choose the INCORRECT statement about HCN. A) There are two π bonds. B) There are two σ bonds. C) N has a lone pair. D) The molecule is bent. E) C has sp hybridization. 30) Choose the INCORRECT statement about NH2-. A) There are no π bonds. B) There are two σ bonds. C) N is sp3 hybridization. D) The molecule is bent. E) There is one lone pair on N.