Acids and Bases: Interactive Quizzes and Learning Materials

Question 1

What is the conjugate acid of ammonia (NH₃) according to the Brønsted-Lowry theory?

Accepted Answer

Ammonium ion (NH₄⁺)

Answer

Water (H₂O)

Answer

Hydroxide ion (OH⁻)

Question 2

Which of the following reactions involves the transfer of protons (H+) from an acid to a base, resulting in the formation of salt and water?

Accepted Answer

Sodium hydroxide + hydrochloric acid → sodium chloride + water

Answer

Sodium chloride + silver nitrate → silver chloride + sodium nitrate

Answer

Magnesium + hydrochloric acid → magnesium chloride + hydrogen gas

Answer

Carbon dioxide + water → carbonic acid

Question 3

Which of the following substances completely dissociates in water to form hydroxide ions (OH-) and is therefore classified as a strong base?

Accepted Answer

Sodium hydroxide

Answer

Acetic acid

Answer

Ammonia

Answer

Hydrochloric acid

Question 4

What species is formed when hydrocyanic acid (HCN) donates a proton (H+)?

Accepted Answer

CN-

Answer

H+

Answer

OH-

Answer

HCN

Question 5

Which substance can react with both acids and bases?

Accepted Answer

Water

Answer

Sodium chloride

Answer

Nitric acid

Answer

Potassium hydroxide

Question 6

What is the conjugate base of H2SO4?

Accepted Answer

SO42-

Answer

HSO4-

Answer

H3O+

Answer

OH-

Question 7

Which of the following is an illustration of a Lewis acid?

Accepted Answer

Boron trifluoride (BF3)

Answer

Hydrochloric acid (HCl)

Answer

Sodium hydroxide (NaOH)

Answer

Ammonia (NH3)

Question 8

Which of the following is considered a buffer solution?

Accepted Answer

A solution containing a weak acid and its conjugate base

Answer

A solution containing a strong acid and its conjugate base

Answer

A solution containing a weak base and its conjugate acid

Answer

A solution containing a strong base and its conjugate acid

Question 9

What is the conjugate acid of the base NH3?

Accepted Answer

NH4+

Answer

NH2-

Answer

H+

Answer

OH-

Question 10

Which of the following reactions represents an acid-base neutralization reaction?

Accepted Answer

HCl + NaOH -> NaCl + H2O

Answer

CH3COOH + C2H5OH -> CH3COOC2H5 + H2O

Answer

2Al + 6HCl -> 2AlCl3 + 3H2

Answer

Fe2O3 + 3H2SO4 -> Fe2(SO4)3 + 3H2O

Question 11

What is the primary function of a buffer solution?

Accepted Answer

To maintain a relatively constant pH when small amounts of an acid or base are added

Answer

To increase the pH of a solution

Answer

To decrease the pH of a solution

Answer

To neutralize acids and bases

Question 12

What is the key difference between a strong acid and a weak acid?

Accepted Answer

Strong acids ionize 100% in water, while weak acids ionize only partially.

Answer

Weak acids ionize 100% in water, while strong acids ionize only partially.

Answer

Strong acids have a higher pH than weak acids.

Answer

Weak acids have a higher pH than strong acids.

Question 13

According to the Arrhenius theory, an acid is a substance that:

Accepted Answer

Donates a proton (H+ ion)

Answer

Accepts a proton (H+ ion)

Answer

Produces hydroxide ions (OH-) in water

Answer

Neutralizes a base to form salt and water

Question 14

Which of the following is classified as a weak acid?

Accepted Answer

Acetic acid (CH3COOH)

Answer

Hydrochloric acid (HCl)

Answer

Sulfuric acid (H2SO4)

Answer

Nitric acid (HNO3)

Question 15

Which of the following reactions best represents a neutralization reaction?

Accepted Answer

Acid + Base → Salt + Water

Answer

Acid + Metal → Salt + Hydrogen

Answer

Base + Metal → Salt + Hydrogen

Answer

Acid + Carbonate → Salt + Carbon Dioxide + Water

Question 16

Identify the conjugate acid of NH3.

Accepted Answer

NH4+

Answer

NH2-

Answer

H3N

Answer

OH-

Question 17

What is the primary function of an indicator in an acid-base titration?

Accepted Answer

To indicate the endpoint of the reaction by changing color

Answer

To neutralize the acid or base

Answer

To catalyze the reaction

Answer

To measure the pH of the solution

Question 18

Identify the conjugate base of HCl.

Accepted Answer

Cl-

Answer

H2O

Answer

OH-

Answer

H+

Question 19

Which of the following is classified as a weak acid?

Accepted Answer

CH3COOH

Answer

HCl

Answer

H2SO4

Answer

HNO3

Question 20

State the purpose of a buffer solution.

Accepted Answer

Maintain constant pH

Answer

Neutralize acids

Answer

Enhance solution conductivity

Answer

Act as a catalyst

Question 21

Which reaction represents neutralization?

Accepted Answer

NaOH + HCl → NaCl + H2O

Answer

MgCO3 + 2HCl → MgCl2 + CO2 + H2O

Answer

Fe + 2HCl → FeCl2 + H2

Answer

NH3 + HCl → NH4Cl

Question 22

Define the titration endpoint.

Accepted Answer

Reactants are fully consumed

Answer

Solution becomes acidic

Answer

Solution becomes basic

Answer

Solution changes color

Question 23

Identify the strong acid from the following:

Accepted Answer

Hydrochloric acid

Answer

Acetic acid

Answer

Carbonic acid

Answer

Ammonium hydroxide

Question 24

Which of the following is considered a weak base?

Accepted Answer

Ammonia

Answer

Sodium hydroxide

Answer

Potassium hydroxide

Answer

Calcium hydroxide

Question 25

Define a buffer solution:

Accepted Answer

A solution that resists changes in pH

Answer

A solution with a high concentration of H+

Answer

A solution with a low concentration of OH-

Answer

A solution that is highly acidic

Question 26

According to Arrhenius' definition, a base is a substance that:

Accepted Answer

Produces hydroxide ions (OH-) in water

Answer

Produces hydrogen ions (H+) in water

Answer

Donates protons (H+)

Answer

Accepts protons (H+)

Question 27

Which of the following acids is considered a weak acid?

Accepted Answer

Acetic acid (CH3COOH)

Answer

Hydrochloric acid (HCl)

Answer

Nitric acid (HNO3)

Answer

Sulfuric acid (H2SO4)

Question 28

When sodium hydroxide (NaOH) reacts with hydrochloric acid (HCl), what formula represents the salt produced?

Accepted Answer

NaCl

Answer

NaHCO3

Answer

Na2CO3

Answer

NaOHCl

Question 29

Which indicator is most suitable for titrating a strong acid with a strong base?

Accepted Answer

Phenolphthalein

Answer

Litmus

Answer

Methyl orange

Answer

Universal indicator

Question 30

According to the Lewis definition, which of the following is a Lewis acid?

Accepted Answer

BF3

Answer

OH-

Answer

H+

Answer

H2O

Question 31

Which of the following salts exhibits an acidic nature in solution?

Accepted Answer

NH4Cl

Answer

NaCl

Answer

Na2CO3

Answer

KNO3

Question 32

In the reaction BF3 + NH3 → BF3NH3, which substance acts as the Lewis base?

Accepted Answer

NH3

Answer

BF3

Answer

F-

Answer

H+

Question 33

Which indicator changes color from red to yellow in an acidic solution?

Accepted Answer

Methyl orange

Answer

Phenolphthalein

Answer

Litmus

Answer

Universal indicator

Question 34

According to the Bronsted-Lowry theory, an acid is a substance that:

Accepted Answer

Donates hydrogen ions (H+)

Answer

Accepts hydrogen ions (H+)

Answer

Releases hydroxide ions (OH-)

Answer

Has a pH less than 7

Question 35

What is the conjugate base of the acid H2SO4?

Accepted Answer

SO42-

Answer

HSO4-

Answer

H3O+

Answer

OH-

Question 36

Which of the following is considered a strong acid?

Accepted Answer

Hydrochloric acid (HCl)

Answer

Acetic acid (CH3COOH)

Answer

Carbonic acid (H2CO3)

Answer

Ammonia (NH3)

Question 37

What is the main product of a reaction between an acid and a base?

Accepted Answer

A salt and water

Answer

A gas and water

Answer

A precipitate and water

Answer

An acid and a base

Question 38

What is the primary function of an indicator in a titration?

Accepted Answer

To indicate the endpoint of the reaction

Answer

To neutralize the solution

Answer

To adjust the pH of the solution

Answer

To catalyze the reaction

Question 39

Which of the following is classified as a Lewis acid?

Accepted Answer

BF3

Answer

NH3

Answer

H2O

Answer

NaOH

Question 40

What is the hybridization of the nitrogen atom in the ammonium ion (NH4+)?

Accepted Answer

sp3

Answer

sp

Answer

sp2

Answer

sp3d

Question 41

According to the Arrhenius theory, an acid is a substance that:

Accepted Answer

Produces hydrogen ions (H+) in water

Answer

Produces hydroxide ions (OH-) in water

Answer

Accepts electrons

Answer

Donates electrons

Question 42

Which of the following is a strong acid?

Accepted Answer

Hydrochloric acid

Answer

Acetic acid

Answer

Carbonic acid

Answer

Ammonia

Question 43

What is the conjugate base of sulfuric acid (H2SO4)?

Accepted Answer

SO42-

Answer

HSO4-

Answer

OH-

Answer

H3O+

Question 44

What is the approximate pH of a 0.1 M solution of NaOH?

Accepted Answer

13

Answer

0

Answer

7

Answer

14

Question 45

What is the primary function of a buffer solution?

Accepted Answer

Maintain a stable pH

Answer

Neutralize acids and bases

Answer

Act as a catalyst

Answer

Change the color of indicators

Question 46

According to the Lewis definition, which species is a Lewis acid?

Accepted Answer

BF3

Answer

HCl

Answer

CH3OH

Answer

NH3

Question 47

According to the Bronsted-Lowry theory, an acid is a substance that:

Accepted Answer

Donates H+ ions

Answer

Accepts H+ ions

Answer

Produces hydroxyl ions

Answer

Releases hydroxide ions

Question 48

What is the conjugate base of HCl?

Accepted Answer

Cl-

Answer

H2O

Answer

OH-

Answer

H+

Question 49

What is the name of the reaction between an acid and a base?

Accepted Answer

Neutralization

Answer

Precipitation

Answer

Oxidation-reduction

Answer

Combustion

Question 50

Which Lewis structure represents a weak acid?

Accepted Answer

H-N-H

Answer

H-O-H

Answer

H-Cl

Answer

H-F

Question 51

What is the role of water in acid-base reactions?

Accepted Answer

It is a solvent that enables ions to interact

Answer

It is a reactant that is consumed

Answer

It is a catalyst that speeds up the reaction

Answer

It is a byproduct that is produced

Question 52

How does a monoprotic acid differ from a polyprotic acid?

Accepted Answer

Monoprotic acids donate one H+ ion, while polyprotic acids donate more than one H+ ion

Answer

Polyprotic acids donate one H+ ion, while monoprotic acids donate more than one H+ ion

Answer

Monoprotic acids have a strong conjugate base, while polyprotic acids have a weak conjugate base

Answer

Polyprotic acids have a strong conjugate base, while monoprotic acids have a weak conjugate base

Question 53

Which of the following is NOT a typical property of acids?

Accepted Answer

Insulating behavior in aqueous solution

Answer

Sour taste

Answer

Corrosiveness

Answer

Ability to neutralize bases

Question 54

What is the conjugate base of ammonium ion (NH4+)?

Accepted Answer

NH3

Answer

NH2-

Answer

H+

Answer

OH-

Question 55

What is the primary function of a buffer solution?

Accepted Answer

To maintain a relatively constant pH when small amounts of acid or base are added

Answer

To neutralize strong acids or bases

Answer

To act as an indicator

Answer

To enhance the conductivity of solutions

Question 56

What is the hybridization of the nitrogen atom in the ammonium ion (NH4+)?

Accepted Answer

sp3

Answer

sp

Answer

sp2

Answer

sp3d