Question 1

Which of the following intermolecular forces is present in all molecular substances, regardless of their polarity?

Accepted Answer

Dispersion forces

Question 2

Consider the set of isoelectronic atoms and ions A$^{+}$, B$^{-}$, C, D$^{+}$, and E$^{2+}$. Which arrangement of relative radii is correct?

Accepted Answer

B$^{-}$ > C > D$^{+}$ > A$^{+}$ > E$^{2+}$

Question 3

Which intermolecular force is primarily responsible for the low boiling point of methane (CH$_4$)?

Accepted Answer

London dispersion forces

Question 4

Which of these ionic solids would have the largest lattice energy?

Accepted Answer

NaF

Question 5

Select the strongest bond in the following group.

Accepted Answer

C$	riple$C

Question 6

The formal charge on sulfur in SO$_2$ is ________, where the Lewis structure of the ion is: $\begin{array}{c} :O: \quad \quad :O: \ \quad \quad || \ \quad \quad S \ \end{array}$

Accepted Answer

-2

Question 7

Which property increases as you move from left to right across a period in the periodic table?

Accepted Answer

Electronegativity

Question 8

Compared to selenium, bromine has a ________ effective nuclear charge (Z$_{eff}$) and a ________ atomic radius.

Accepted Answer

higher; smaller

Question 9

Using condensed electron configurations, predict the ground state electron configuration of Te$^{2-}$.

Accepted Answer

[Kr] 5s$^2$ 4d$^{10}$ 5p$^6$

Question 10

Although I$_2$ is known, F$_2^-$ is not. Which statement best explains this?

Accepted Answer

Fluorine is too electronegative to form a stable F$_2^-$ ion.

Question 11

What is the molecular geometry and hybridization of the central atom in PF$_3$?

Accepted Answer

Tetrahedral; sp$^3$

Question 12

Which molecule is polar?

Accepted Answer

NH$_3$

Question 13

What is the approximate bond angle in a molecule with tetrahedral electron domain geometry?

Accepted Answer

$109.5^\circ$

Question 14

Which of the following best describes the electron-domain geometry of TeBr$_4$?

Accepted Answer

Trigonal bipyramidal

Question 15

Which of the following elements has the highest electronegativity?

Accepted Answer

Fluorine

Question 16

What is the condensed electron configuration for Rb$^{+}$?

Accepted Answer

[Kr]

Question 17

Which of the following is a correct statement about the periodic trend in atomic radius?

Accepted Answer

Atomic radius decreases across a period.

Question 18

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

Accepted Answer

BF$_3$

Question 19

Which of the following is the best explanation for the high lattice energy of NaF compared to NaCl?

Accepted Answer

F$^-$ is smaller than Cl$^-$, leading to stronger electrostatic attraction.

Question 20

Which of the following best describes the hybridization of the oxygen atom labeled 'y' in the molecule below?

H—C≡C—C—O—H
      |      |
      H      H

Accepted Answer

sp$^3$

General Chemistry II: Practice Exam 2 Study Guide

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