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Question 1. Which one of the following molecules is polar?
a. BF3 b. CF4 c. XeF4 d. ClF3 e. BeF2
Question 2. A p bond
a. is stronger than a sigma bond b. results from orbital overlap over and under the bond axis c. is the same strength as a sigma bond d. results from the overlap of orbitals on only one side of the bonded atoms
Question 3. The dipole moment in a molecule with the formula AX6
a. is always zero b. can be nonzero c. is always nonzero
Question 4. The total number of electrons that can be accommodated in a bonding orbital is:
a. 2 b. 3 c. 1 d. 4
Question 5. Describe a triple bond in terms of sigma and pi bonds.
a. two bonds are sigma, one is pi b. three bonds are sigma c. three bonds are pi d. two bonds are pi, one is sigma
Question 6. A molecule with the formula AX4 is found to be nonpolar. Which of the following shapes could it have?
a. tetrahedral b. seesaw c. square planar d. either tetrahedral or square planar e. any of the above shapes
Question 7. What type of hybrid orbitals are used for phosphorus to describe the bonding in PH3?
a. sp b. sp2 c. p3 d. sp3 e. sp3d
Question 8. Square planar geometry is described by which type of hybrid orbitals on the central atom?
a. sp3 b. spd c. sp3d2 d. sd3 e. sp2
Question 9. Which molecules are paramagnetic?
a. CO2 b. N2 c. CH4 d. NO2 e. none of them
Question 10. Which molecule has the greatest angle between bonds?
a. H2O b. PH3 c. BF3 d. CH4 e. NH3
Question 11. The angle between N-H bonds in NH3 is closer to:
a. 109o b. 120o c. 90o
Question 12. How many s and p bonds, respectively, are in the following molecule: CH3CH2CHCHCH2CH3?
a. 18, 1 b. 17, 1 c. 19, 0 d. 16, 1 e. 14, 5
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