Question 1

Which of the following electron configurations correctly represents the ground state of phosphorus (Z=15)?

Accepted Answer

Ne10 3s2 3p3

Question 2

According to the periodic trend, which element has the highest electronegativity among the following?

Accepted Answer

Cl

Question 3

Which statement best describes the octet rule for oxygen in the molecule H3C-O-H?

Accepted Answer

Oxygen possesses 8 octet electrons: 6 valence and 2 shared electrons.

Question 4

What is the formal charge on the nitrogen atom in the ammonia molecule (NH3)?

Accepted Answer

0

Question 5

When drawing Lewis Dot Structures, which element should never be placed in the center of the molecule?

Accepted Answer

H

Question 6

How many resonance structures are possible for the nitrate ion (NO3-)?

Accepted Answer

3

Question 7

What is the hybridization of the central carbon atom in HCN?

Accepted Answer

sp

Question 8

Which of the following molecules is polar?

Accepted Answer

NF3

Question 9

Which functional group is present in the following molecule: $$CH_3-$$COOH?

Accepted Answer

Carboxylic acid

Question 10

Which of the following is a hydrocarbon?

Accepted Answer

$$CH_4$$

Question 11

Which statement about isotopes is correct?

Accepted Answer

Isotopes have the same atomic number but different mass numbers.

Question 12

What is the charge of a hydride ion (H-)?

Accepted Answer

-1

Question 13

Which principle is violated if two electrons in the same orbital have the same spin?

Accepted Answer

Pauli Exclusion Principle

Question 14

What is the condensed electron configuration for chlorine (Z=17)?

Accepted Answer

Ne10 3s2 3p5

Question 15

Which of the following molecules contains a trigonal planar geometry?

Accepted Answer

BF3

Question 16

Which of the following statements about resonance structures is correct?

Accepted Answer

Resonance structures differ only in the arrangement of electrons.

Question 17

What is the formal charge on the central carbon atom in COCl2?

Accepted Answer

0

Question 18

Which of the following best describes a nonpolar molecule?

Accepted Answer

A molecule with a perfect shape and no lone pairs on the central atom.

General Chemistry: Atomic Structure, Bonding, and Molecular Properties Study Guide

Study Guide - Practice Questions