Question 1

Which of the following molecules has a bent molecular geometry due to the presence of lone pairs on the central atom?

Accepted Answer

H$_2$O

Question 2

According to VSEPR theory, what is the bond angle in a molecule with a trigonal planar geometry?

Accepted Answer

$120^\circ$

Question 3

Which of the following elements is most likely to violate the octet rule by having fewer than 8 valence electrons?

Accepted Answer

Boron (B)

Question 4

What is the correct Lewis dot structure for ammonia (NH$_3$)?

Accepted Answer

N with three single bonds to H and one lone pair

Question 5

Which molecule is polar due to both its shape and difference in electronegativity?

Accepted Answer

H$_2$O

Question 6

How many valence electrons are present in a molecule of CS$_2$?

Accepted Answer

18

Question 7

Which of the following statements about electronegativity is TRUE?

Accepted Answer

Electronegativity increases across a period from left to right.

Question 8

What is the molecular shape of methane (CH$_4$) according to VSEPR theory?

Accepted Answer

Tetrahedral

Question 9

Which of the following molecules is non-polar despite having polar bonds?

Accepted Answer

CO$_2$

Question 10

A molecule has the formula AB$_2$ and a bond angle of $180^\circ$. What is its molecular geometry?

Accepted Answer

Linear

Question 11

Which of the following is an exception to the octet rule because it can have more than 8 electrons around the central atom?

Accepted Answer

SF$_6$

Question 12

What is the formal charge on the oxygen atom in H$_2$O?

Accepted Answer

0

Question 13

Which of the following best explains why F$_2$O is polar?

Accepted Answer

It has a bent shape and unequal electronegativity.

Question 14

Which of the following compounds is named correctly according to molecular (covalent) naming rules?

Accepted Answer

Carbon dioxide (CO$_2$)

Question 15

What is the total number of valence electrons in NH$_4^+$?

Accepted Answer

9

Question 16

Which of the following molecules has a trigonal pyramidal shape?

Accepted Answer

NH$_3$

Question 17

Which of the following is the correct formula for dinitrogen tetroxide?

Accepted Answer

N$_2$O$_4$

Question 18

Which factor(s) determine whether a molecule is polar or non-polar?

Accepted Answer

Both the shape and the difference in electronegativity

Question 19

What is the correct Lewis structure for CO$_2$?

Accepted Answer

O=C=O with no lone pairs on C and two lone pairs on each O

Question 20

Which of the following best describes the difference between polar covalent and non-polar covalent bonds?

Accepted Answer

Polar covalent bonds have unequal sharing of electrons due to differences in electronegativity.

Molecular Bonding, Lewis Structures, and Molecular Geometry in GOB Chemistry

Study Guide - Practice Questions