Question 1

Which of the following molecules exhibits a trigonal planar molecular geometry according to VSEPR theory?

Accepted Answer

C\_2H\_4

Question 2

What is the primary reason lone pairs occupy equatorial positions in a trigonal bipyramidal electron pair geometry?

Accepted Answer

Equatorial positions have less repulsion due to fewer 90° interactions.

Question 3

Which intermolecular force is responsible for the unusually high boiling point of water ($$H_2O$$)?

Accepted Answer

Hydrogen bonding

Question 4

A molecule of $$PF_5$$ has which electron pair geometry and molecular geometry?

Accepted Answer

Trigonal bipyramidal, trigonal bipyramidal

Question 5

Which of the following statements about intermolecular forces is correct?

Accepted Answer

Intermolecular forces decrease rapidly with increasing distance between molecules.

Question 6

What is the molecular geometry of $$NH_3$$ and what is the approximate bond angle?

Accepted Answer

Trigonal pyramidal, $$107.3^\	ext{o}$$

Question 7

Which molecule would you expect to have only London dispersion forces as its intermolecular force?

Accepted Answer

Br\_2

Question 8

A patient is given a medication that contains $$CH_3OH ($$methanol). Which intermolecular forces are present in liquid methanol?

Accepted Answer

Dipole-dipole and hydrogen bonding

Question 9

Which of the following molecules has a bent molecular geometry?

Accepted Answer

H\_2O

Question 10

Why does $$SF_6$$ have an octahedral molecular geometry?

Accepted Answer

It has six bonding pairs and no lone pairs on the central atom.

Question 11

Which molecule would have the strongest London dispersion forces?

Accepted Answer

I\_2

Question 12

A chemist is analyzing $$NF_3. $$What is its electron pair geometry and molecular geometry?

Accepted Answer

Tetrahedral, trigonal pyramidal

Question 13

Which of the following best explains why $$H_2S$$ has a much lower boiling point than $$H_2O$$?

Accepted Answer

Sulfur is less electronegative, so $$H_2S$$ cannot form hydrogen bonds.

Question 14

Which of the following molecules has a seesaw molecular geometry?

Accepted Answer

SF\_4

Question 15

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

Accepted Answer

Trigonal pyramidal

Question 16

Which of the following is true about the relationship between electron pair geometry and molecular geometry?

Accepted Answer

They are the same only when the central atom has no lone pairs.

Question 17

Which intermolecular force is present in all molecules, regardless of polarity?

Accepted Answer

London dispersion forces

Question 18

A sample of $$XeF_2 is $$analyzed. What is its molecular geometry?

Accepted Answer

Linear

Question 19

Which of the following molecules can form hydrogen bonds with water?

Accepted Answer

NH\_3

Question 20

A researcher is studying $$NH_2CONH_2 ($$urea). What are the molecular geometries around the carbon and nitrogen atoms, respectively?

Accepted Answer

Carbon: trigonal planar; Nitrogen: trigonal pyramidal

Molecular Geometry and Intermolecular Forces: VSEPR Theory and Types of Intermolecular Attractions

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