Question 1

What is the ideal bond angle for a molecule with three electron groups and no lone pairs on the central atom?

Accepted Answer

$$120^\circ$$

Question 2

If the H–C–H bond angle in CH$$_4 is$$ $$109.5^\circ$$, what is the H–N–H bond angle in NH$$_3$$?

Accepted Answer

$$107.3^\circ$$

Question 3

Which of the following best explains why the bond angle in H$$_2O is $$less than $$109.5^\circ$$?

Accepted Answer

The presence of two lone pairs increases electron repulsion, decreasing the bond angle.

Question 4

Determine the bond angle for the BeCl$$_2$$ molecule.

Accepted Answer

$$180^\circ$$

Question 5

Which molecular geometry is associated with a bond angle of $$120^\circ$$?

Accepted Answer

Trigonal planar

Question 6

For the thiocyanate ion, SCN$$^-$$, what is the expected bond angle between the atoms?

Accepted Answer

$$180^\circ$$

Question 7

What is the Cl–O–Cl bond angle in the OCl$$_2$$ molecule?

Accepted Answer

$$109.5^\circ$$

Question 8

A molecule has four electron groups around the central atom, with one lone pair. What is the expected bond angle?

Accepted Answer

$$107.3^\circ$$

Question 9

Which statement best describes the effect of lone pairs on bond angles?

Accepted Answer

Lone pairs decrease bond angles due to increased repulsion.

Question 10

Given a molecule with two electron groups and no lone pairs, what is its molecular geometry and bond angle?

Accepted Answer

Linear, $$180^\circ$$

Question 11

Which of the following compounds has a bond angle closest to $$120^\circ$$?

Accepted Answer

BF$$_3$$

Question 12

A molecule has three electron groups, one of which is a lone pair. What is the expected bond angle?

Accepted Answer

$$\u003c120^\circ$$

Question 13

Which of the following best describes the bond angle in a molecule with a tetrahedral electron geometry and two lone pairs?

Accepted Answer

$$104.5^\circ$$

Question 14

What is the bond angle in a molecule with a trigonal planar geometry and no lone pairs?

Accepted Answer

$$120^\circ$$

Question 15

Which of the following molecules is expected to have a bond angle of $$180^\circ$$?

Accepted Answer

CO$$_2$$

Question 16

If a molecule has four electron groups and two lone pairs, what is its molecular geometry?

Accepted Answer

Bent

Question 17

Which of the following best describes the bond angle in the SnH$$_2$$ molecule?

Accepted Answer

$$104.5^\circ$$

Question 18

A molecule has three electron groups and no lone pairs. Which of the following is true?

Accepted Answer

It has a trigonal planar geometry and a bond angle of $$120^\circ.$$

Question 19

Which of the following statements is correct regarding electron group repulsion and bond angles?

Accepted Answer

More lone pairs on the central atom result in smaller bond angles.

Question 20

Which molecule would you expect to have the smallest bond angle?

Accepted Answer

H$$_2O$$

Bond Angles and Molecular Geometry: Study Notes for GOB Chemistry

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