The selenium hexafluoride molecule is nonpolar and contains no lone (unshared) electron pairs on the selenium atom. What are all of the possible F-Se-F bond angles?

1
The selenium hexafluoride molecule is nonpolar
and contains no lone (unshared) electron pairs on
the selenium atom. What are all of the possible
F-Se-F bond angles?

1. 120
2. 180
3. 90 and 180
4. 90, 120, and 180
5. 109.5

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2
A hypothetical AB3 molecule has two (2) lone
(unshared) electron pairs on A. The hybridization
at A is _____.

1. sp
2. sp2
3. sp3
4. sp3d
5. sp3d2

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3
The nitrite ion, NO2-, is known to be angular.
The nitrogen atom is the central atom and the
oxygen atoms are equidistant from it. On the
basis of these facts, which of the following
conclusions may be drawn concerning this ion?
Choose the answer that includes all the correct
conclusions, and no others. I. It can be
represented by resonance formulas. II. The
dipoles associated with each nitrogen-oxygen bond
are equal in magnitude. III. The dipoles
associated with the nitrogen-oxygen bonds are
opposite in direction. IV. The nitrogen atom is
sp hybridized. V. The nitrite ion makes no
contribution to the polarity of compounds in
which it is contained.

1. II and III
2. I and II
3. I, III, and V
4. I, III, and IV
5. II, III, and IV

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4
Which of the following statements concerning
BeCl2 is false?

1. BeCl2 is a linear molecule.
2. The hybridization of the central Be atom is sp.
3. The electronegativity difference between Be and
   Cl is so large (1.5 units) that BeCl2 is an ionic
   compound.
4. Because the bond angle is 180 the two bond
   dipoles cancel to give a nonpolar molecule.
5. The Be atom in BeCl2 does not satisfy the octet
   rule.

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5
The silicon atom in the SiH4 molecule is _____
hybridized and the H-Si-H bond angles are _____.

1. sp2, 120
2. sp2, 109.5
3. sp3, 109.5
4. sp3, 120
5. sp2, 90

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6
Consider the bonding in the SiH4 molecule. Which
response includes all the following statements
that are true, and no false statements? I. SiH4
is a polar molecule. II. The H-Si-H bond angles
are 120. III. The SiH4 molecule is tetrahedral.
IV. The hybridization of Si is sp2.

1. I and III
2. II and IV
3. III
4. I, II, and IV
5. I and II

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7
Which statement is false?

1. Lone pairs of electrons repel each other more
   strongly than bonding pairs repel each other.
2. Lone pairs of electrons repel each other more
   strongly than they repel bonding pairs.
3. Lone pairs of electrons are considered a part of
   the electronic geometry about a central atom.
4. Lone pairs of electrons have no effect on the
   molecular geometry about an atom.
5. Lone pairs of electrons are not considered a part
   of the molecular geometry about a central atom.

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8
Which response contains all the characteristics
listed that should apply to phosphorus
trichloride, PCl3, and no other characteristics?
I. trigonal planar II. polar bonds III. sp2
hybridized at P IV. polar molecule V. one
unshared pair of electrons on P

1. I, IV, and V
2. II, III, and IV
3. I, II, and IV
4. II, IV, and V
5. none of these

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9
Why are hybrid orbitals not proposed in
describing the bonding in H2S, H2Se and H2Te?

1. They are all linear molecules.
2. Their bond angles are close to the 90 angle
   between two unhybridized p orbitals.
3. All three of these molecules are nonpolar.
4. They have d orbitals in their valence shells.
5. They each have two lone pairs of electrons on the
   central atom.

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10
Draw the dot formula for SF4. What is the
hybridization at S?

1. sp
2. sp2
3. sp3
4. sp3d
5. sp3d2

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11
The F-S-F bond angles in SF6 are _____.

1. 109.5
2. 120
3. 90 and 120
4. 45 and 90
5. 90 and 180

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12
Which of the following species does not have
octahedral electronic geometry?

1. SeF6
2. BrF5
3. XeF4
4. PF6
5. SF4

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13
Which molecule is incorrectly matched with the
molecular geometry? Molecule / Molecular Geometry

1. TeF6 / octahedral
2. NH3 / tetrahedral
3. AsF5 / trigonal bipyramidal
4. SiF4 / tetrahedral
5. H2O / angular

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14
Which molecule or polyatomic ion is incorrectly
matched with the molecular (or ionic)
geometry?Ion / Molecular Geometry

1. SiCl62- / trigonal bipyramidal
2. PH4 / tetrahedral
3. ClO2- / angular
4. NH4 / tetrahedral
5. SO42- / tetrahedral

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15
Which species is incorrectly matched with the
hybridization at the central atom? Compound /
Hybridization at Central Atom

1. BF3/ sp2
2. SnCl4/ sp3
3. AsF5/ sp3d2
4. H2O / sp3
5. BeCl2/ sp

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16
Which one of the following molecules is polar?

1. SiH4
2. SF6
3. H2S
4. PCl5
5. SiF4

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17
Which response contains all of the polar
molecules below and no nonpolar molecules? I. BF3
II. PF3 III. H2O IV. PF5 V. TeF6 (Te is in Group
VIA)

1. I, II, and IV
2. II, III, and V
3. III
4. II and III
5. another one or another combination

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18
Which compound consists of nonpolar molecules?
(It may help to draw dot formulas.)

1. H2S
2. PH3
3. AsCl3
4. SiH4
5. SF4

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