9. Which of the following statements is (are) correct? (A)Electrons are never found in an antibonding molecular orbital. (B)All antibonding molecular orbitals are higher in energy than the atomic orbitals of which they are composed. (C)Antibonding molecular orbitals have electron density mainly outside the space between the two nuclei. (D)The fact that O2 is paramagnetic can be explained by the molecular orbital diagram for O2 . (E)None of the above is true.

4. Consider the following gas samples: (A)The volume of sample A is twice the volume of sample B. (B)The mean square velocity of molecules in sample A is twice as large as the mean square velocity of molecules in sample B. (C)The fraction of molecules in sample A, having a kinetic energy greater than some high fixed value, is larger than the fraction of molecules in sample B, having kinetic energies greater than that same high fixed value. (D)Assuming identical intermolecular forces in the two samples, sample A should be more nearly ideal than sample B. (E)The average kinetic energy of the molecules in sample A is twice the average kinetic energy of the molecules in sample B.

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