Self Assessment B


1	Which of the compounds listed below is not linear?
		A)	SO₂
		B)	CO₂
		C)	I₃^-
		D)	N₃^-


2	Which of the species below has two nonbonded electron pairs on the central atom?
		A)	BCl₃
		B)	PCl₃
		C)	XeF₄
		D)	SF₄
		E)	SF₆


3	Which of the following species is not planar?
		A)	SF₄
		B)	H₂C=CH₂
		C)	BCl₃
		D)	XeF₄


4	Which is true for carbon monoxide?
		A)	CO has a short CO bond.
		B)	CO has a zero dipole moment.
		C)	The bond energy in CO is low.
		D)	The atoms in CO cannot obey the octet rule.
		E)	All of the above are true about CO.


5	Which of the following molecules has no dipole moment and a central atom with sp³d hybridization?
		A)	PCl₃
		B)	BF₃
		C)	SF₄
		D)	BrF₅
		E)	PCl₅


6	If the geometry of around the central atom of an ion or compound is octahedral, what must be the hybridization of the central atom?
		A)	sp
		B)	dsp²
		C)	dsp³
		D)	sp³d²
		E)	The central atom would not have hybridized orbitals.


7	The C₂H₂ molecule contains _____ pi bonds and the C atoms are ______ hybridized.
		A)	2, sp²
		B)	2, sp
		C)	1, sp
		D)	1, sp
		E)	3, sp


8	What is the bond order for the species O₂⁺?
		A)	1
		B)	1.5
		C)	2
		D)	2.5


9	Assume that an N₂ molecule absorbs a photon and goes to its first excited state.
		A)	The excited N₂ is less stable than N₂ in the ground state.
		B)	The excited N₂ is more stable than N₂ in the ground state.
		C)	The bond length of N₂ in the excited state is shorter than the bond length of N₂ in the ground state.
		D)	B and C are both true.


10	Which of the following has delocalized molecular orbitals?
		A)	NO₃^-
		B)	CO₃^-
		C)	NH₄>⁺
		D)	HO>^-
		E)	A and B.

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