Question 1

Which of the following statements best describes the difference between electron geometry and molecular geometry?

Accepted Answer

Electron geometry includes all electron groups (bonding and lone pairs), while molecular geometry considers only the arrangement of atoms.

Question 2

What is the molecular geometry and approximate bond angle of $$	ext{SO}_2$$?

Accepted Answer

Bent, $$\u003c120^	ext{o}$$

Question 3

A molecule has four electron groups around the central atom, one of which is a lone pair. What is its molecular geometry?

Accepted Answer

Trigonal pyramidal

Question 4

Which of the following molecules is always polar due to the presence of lone pairs, regardless of the terminal atoms?

Accepted Answer

Seesaw

Question 5

What is the hybridization of the central atom in $$	ext{BF}_3$$?

Accepted Answer

$$sp^2$$

Question 6

Which of the following best explains why lone pairs occupy more space than bonding pairs in VSEPR theory?

Accepted Answer

Lone pairs are closer to the nucleus and repel bonding pairs more strongly.

Question 7

Which of the following molecules is nonpolar, even though it contains polar bonds?

Accepted Answer

$$	ext{CO}_2$$

Question 8

A molecule has five electron groups: four bonding pairs and one lone pair. What is its molecular geometry?

Accepted Answer

Seesaw

Question 9

Which of the following molecules has a bond angle closest to $$109.5^	ext{o}$$?

Accepted Answer

$$	ext{CH}_4$$

Question 10

What is the electron geometry and molecular geometry of $$	ext{SF}_6$$?

Accepted Answer

Octahedral, octahedral

Question 11

Which of the following best describes the polarity of $$	ext{NH}_3$$?

Accepted Answer

Polar due to the presence of a lone pair on nitrogen

Question 12

A molecule has six electron groups: four bonding pairs and two lone pairs. What is its molecular geometry?

Accepted Answer

Square planar

Question 13

Which of the following molecules is expected to have a net dipole moment?

Accepted Answer

$$	ext{CH}_2	ext{Cl}_2$$

Question 14

What is the hybridization of the central atom in $$	ext{SF}_4$$?

Accepted Answer

$$sp^3d$

Question 15

Which of the following best describes the bond angles in a molecule with trigonal bipyramidal electron geometry and seesaw molecular geometry?

Accepted Answer

$$\u003c120^	ext{o}$$ and $$\u003c90^	ext{o}$$

Question 16

Which of the following molecules is nonpolar due to the cancellation of bond dipoles?

Accepted Answer

$$	ext{BCl}_3$$

Question 17

A molecule has three electron groups: two bonding pairs and one lone pair. What is its molecular geometry?

Accepted Answer

Bent

Question 18

Which of the following statements about polar covalent bonds and polar molecules is correct?

Accepted Answer

Polar covalent bonds may result in a nonpolar molecule if the bond dipoles cancel.

Question 19

Which of the following molecules has a square pyramidal molecular geometry?

Accepted Answer

$$	ext{BrF}_5$$

Question 20

Which of the following best describes the effect of lone pairs on bond angles in a tetrahedral electron geometry?

Accepted Answer

Lone pairs decrease the bond angles between atoms.

Molecular Geometry, Polarity, and Hybridization (Ch. 11.1–11.8): VSEPR, Bond Angles, and Molecular Orbitals

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