Acids and Bases: Interactive Learning Quizzes for Year 13 Chemistry

Question 1

Identify the strong acid from the following options:

Accepted Answer

Hydrochloric acid

Answer

Acetic acid

Answer

Ammonia

Answer

Sodium hydroxide

Question 2

Which of the following is a buffer solution?

Accepted Answer

A combination of a weak acid and its conjugate base

Answer

A mixture of a strong acid and a strong base

Answer

A solution of a salt and water

Answer

A combination of a weak base and its conjugate acid

Question 3

Define the common ion effect:

Accepted Answer

The suppression of ionization of a weak acid or base when a salt containing a common ion is added

Answer

The enhancement of ionization of a weak acid or base when a salt containing a common ion is added

Answer

The formation of a solid precipitate upon the addition of a salt to a solution

Answer

The alteration in color of a solution caused by the addition of an indicator

Question 4

What is a titration?

Accepted Answer

A technique used to ascertain the concentration of an unknown solution by reacting it with a solution of known concentration

Answer

A method for preparing a solution with a specific concentration

Answer

A procedure for measuring the pH of a solution

Answer

A technique for separating different components of a mixture

Question 5

Which of the following is NOT a characteristic of acids according to the Arrhenius definition?

Accepted Answer

Taste bitter

Answer

Turn blue litmus red

Answer

React with metals to produce hydrogen gas

Answer

Conduct electricity in solution

Question 6

The pH of a solution is defined as the negative logarithm of the:

Accepted Answer

Hydrogen ion concentration [H+]

Answer

Hydroxide ion concentration [OH-]

Answer

Dissociation constant (Ka)

Answer

Equilibrium constant (Kc)

Question 7

When a strong acid reacts completely with a strong base in water, the products formed are:

Accepted Answer

A salt and water

Answer

A salt and hydrogen gas

Answer

Water and hydrogen gas

Answer

A salt and oxygen gas

Question 8

A buffer solution is a solution that:

Accepted Answer

Resists significant changes in pH upon the addition of small amounts of acid or base

Answer

Has a very high concentration of hydrogen ions (H+)

Answer

Has a very low concentration of hydrogen ions (H+)

Answer

Is a highly concentrated acid solution

Question 9

Which of the following is a common example of a buffer solution found in the human body?

Accepted Answer

Blood

Answer

Gastric acid

Answer

Seawater

Answer

Vinegar

Question 10

According to the Bronsted-Lowry theory, what is the conjugate base of sulfuric acid (H2SO4)?

Accepted Answer

SO42-

Answer

HSO4-

Answer

H3O+

Question 11

Which of the following is a Bronsted-Lowry acid and donates a proton (H+) in a reaction?

Accepted Answer

HCl

Answer

NH3

Answer

NaCl

Answer

H2O

Question 12

What is the pH of a solution that has a hydrogen ion concentration ([H+]) of 1.0 x 10^-4 M?

Accepted Answer

4

Answer

7

Answer

10

Answer

14

Question 13

Which of the following is a Lewis base and can accept an electron pair?

Accepted Answer

OH-

Answer

BF3

Answer

HNO3

Answer

CH4

Question 14

What is the conjugate base of H2SO4 when it donates a proton?

Accepted Answer

SO42-

Answer

HSO4-

Answer

H3O+

Answer

OH-

Question 15

Which of the following reactions is a classic acid-base reaction where a proton is transferred from an acid to a base?

Accepted Answer

NaOH + H2SO4 → Na2SO4 + H2O

Answer

2HCl + Zn → ZnCl2 + H2

Answer

2Fe + 3Cl2 → 2FeCl3

Answer

CH4 + 2O2 → CO2 + 2H2O

Question 16

Which of the following is the strongest acid, meaning it donates its proton most readily?

Accepted Answer

HI

Answer

HF

Answer

HCl

Answer

HBr

Question 17

According to the Arrhenius theory, which of the following accurately defines an acid?

Accepted Answer

Substance that contributes protons (H+ ions)

Answer

Substance that obtains protons (H+ ions)

Answer

Substance that increases a solution's acidity

Answer

Substance that decreases a solution's acidity

Question 18

The Bronsted-Lowry theory characterizes an acid as a species that:

Accepted Answer

Relinquishes protons

Answer

Acquires protons

Answer

Generates hydroxide ions

Answer

Produces hydrogen ions

Question 19

Calculate the pH of a 0.1 M solution of hydrochloric acid (HCl)?

Accepted Answer

1

Answer

7

Answer

10

Answer

14

Question 20

Which of the following reactions can be classified as an acid-base reaction?

Accepted Answer

NaOH + HCl → NaCl + H2O

Answer

2H2 + O2 → 2H2O

Answer

Fe + CuSO4 → FeSO4 + Cu

Answer

CH4 + 2O2 → CO2 + 2H2O

Question 21

Which solution among the following exhibits the highest pH?

Accepted Answer

0.1 M NaOH

Answer

0.1 M HCl

Answer

0.1 M CH3COOH

Answer

0.1 M NH3

Question 22

Determine the molarity of a solution with a pH of 3:

Accepted Answer

10^-3 M

Answer

10^-7 M

Answer

10^-11 M

Answer

10^-14 M

Question 23

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

Accepted Answer

Produces H+ ions when dissolved in water

Answer

Accepts H+ ions when dissolved in water

Answer

Lowers the pH of a solution

Answer

Raises the pH of a solution

Question 24

Which of the following is a strong base?

Accepted Answer

Sodium hydroxide (NaOH)

Answer

Ammonia (NH3)

Answer

Acetic acid (CH3COOH)

Answer

Carbonic acid (H2CO3)

Question 25

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

Accepted Answer

HCl + NaOH → NaCl + H2O

Answer

2NaOH + CuSO4 → Cu(OH)2 + Na2SO4

Answer

Fe + 2HCl → FeCl2 + H2

Answer

CH3COOH + C2H5OH → CH3COOC2H5 + H2O

Question 26

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

Accepted Answer

SO42-

Answer

HSO4-

Answer

SO32-

Answer

H3O+

Question 27

Which of the following indicators would be most suitable for titrating a weak acid with a strong base?

Accepted Answer

Phenolphthalein

Answer

Methyl orange

Answer

Litmus

Answer

Universal indicator

Question 28

What is the conjugate acid of NH3?

Accepted Answer

NH4+

Answer

N3-

Answer

H3O+

Answer

OH-

Question 29

Which Lewis structure correctly represents the hydroxide ion (OH-)?

Accepted Answer

[:O:H]-

Answer

H:O:

Answer

:O:H:

Answer

[H:O]-

Question 30

Which of the following statements accurately describes an acid according to the Bronsted-Lowry definition?

Accepted Answer

Donates protons in aqueous solutions.

Answer

Has a pH greater than 7.

Answer

Feels slippery to the touch.

Answer

Turns litmus paper blue.

Question 31

Identify the conjugate base of H2SO4.

Accepted Answer

SO42-

Answer

HSO4-

Answer

OH-

Answer

H3O+

Question 32

Which acid among the following is classified as strong?

Accepted Answer

Hydrochloric acid

Answer

Citric acid

Answer

Acetic acid

Answer

Carbonic acid

Question 33

According to the Lewis definition, what is the characteristic of a base?

Accepted Answer

Accepts electron pairs.

Answer

Donates protons.

Answer

Accepts protons.

Answer

Donates electron pairs.

Question 34

Which substance among the following is a Lewis acid?

Accepted Answer

H+

Answer

NH3

Answer

OH-

Answer

CH3COOH

Question 35

Describe the primary function of a buffer solution.

Accepted Answer

Maintain a stable pH.

Answer

Neutralise acids.

Answer

Increase solution conductivity.

Answer

Act as an indicator.

Question 36

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

Accepted Answer

Produces hydrogen ions (H+) in water

Answer

Produces hydroxide ions (OH-) in water

Answer

Donates electrons to another substance

Answer

Accepts protons from another substance

Question 37

Which of the following is a weak acid typically found in vinegar?

Accepted Answer

Acetic acid (CH3COOH)

Answer

Hydrochloric acid (HCl)

Answer

Nitric acid (HNO3)

Answer

Sodium hydroxide (NaOH)

Question 38

Which of the following reactions is an example of an acid-base reaction?

Accepted Answer

CaCO3 + 2HCl → CaCl2 + H2O + CO2

Answer

2Na + 2H2O → 2NaOH + H2

Answer

Fe2O3 + 3H2 → 2Fe + 3H2O

Answer

CH4 + 2O2 → CO2 + 2H2O

Question 39

The conjugate base of a weak acid is:

Accepted Answer

A weak base

Answer

A strong acid

Answer

A strong base

Answer

A neutral substance

Question 40

The titration of a strong acid with a strong base results in a:

Accepted Answer

Neutralization reaction

Answer

Precipitation reaction

Answer

Redox reaction

Answer

Displacement reaction

Question 41

The indicator phenolphthalein turns:

Accepted Answer

Colourless in acidic solutions and pink in basic solutions

Answer

Pink in acidic solutions and colourless in basic solutions

Answer

Yellow in acidic solutions and blue in basic solutions

Answer

Blue in acidic solutions and yellow in basic solutions

Question 42

Which of the following is an example of a buffer solution?

Accepted Answer

A solution of a weak acid and its conjugate base

Answer

A solution of a strong acid and its conjugate base

Answer

A solution of a weak base and its conjugate acid

Answer

A solution of a strong base and its conjugate acid

Question 43

According to the Arrhenius theory, which of the following statements describes acids?

Accepted Answer

Produce hydrogen ions (H+) in aqueous solutions

Answer

Produce hydroxide ions (OH-) in aqueous solutions

Answer

Neutralize bases to form water and a salt

Answer

Are always strong electrolytes

Question 44

Which of the following compounds is considered a weak acid?

Accepted Answer

Acetic acid (CH3COOH)

Answer

Hydrochloric acid (HCl)

Answer

Sulfuric acid (H2SO4)

Answer

Potassium hydroxide (KOH)

Question 45

In the Bronsted-Lowry acid-base theory, what is the conjugate base of H2SO3?

Accepted Answer

HSO3-

Answer

SO32-

Answer

SO42-

Answer

H3O+

Question 46

Which substance can act as both an acid and a base?

Accepted Answer

Water (H2O)

Answer

Sodium chloride (NaCl)

Answer

Sulfuric acid (H2SO4)

Answer

Calcium oxide (CaO)

Question 47

What is the molarity of a solution containing 0.2 moles of NaOH in 1 liter of solution?

Accepted Answer

0.2 M

Answer

0.02 M

Answer

0.1 M

Answer

0.5 M

Question 48

According to the Arrhenius theory, what is the defining characteristic of an acid?

Accepted Answer

An acid produces hydrogen ions (H+) when dissolved in water.

Answer

An acid is a substance with a sour taste.

Answer

An acid donates hydroxide ions (OH-) in water.

Answer

An acid accepts electrons from another substance.

Question 49

Which of the following is considered a strong acid?

Accepted Answer

Hydrochloric acid (HCl)

Answer

Acetic acid (CH3COOH)

Answer

Carbonic acid (H2CO3)

Answer

Citric acid (C6H8O7)

Question 50

What is the pH of a solution with a hydrogen ion concentration of 1 x 10^-4 mol/dm³?

Accepted Answer

4

Answer

6

Answer

2

Answer

8

Question 51

What are the products of the reaction between sodium hydroxide (NaOH) and hydrochloric acid (HCl)?

Accepted Answer

Sodium chloride (NaCl) and water (H2O)

Answer

Water (H2O) and chlorine gas (Cl2)

Answer

Sodium chloride (NaCl) and hydrogen gas (H2)

Answer

Sodium hydroxide (NaOH) and hydrogen gas (H2)

Question 52

Which of the following describes a buffer solution?

Accepted Answer

A solution containing a weak acid and its conjugate base.

Answer

A solution with a pH of 7.

Answer

A solution that readily changes pH upon addition of acid or base.

Answer

A solution containing a strong acid and a strong base.

Question 53

What is the primary role of a catalyst in an acid-base reaction?

Accepted Answer

To increase the reaction rate without being consumed.

Answer

To initiate the reaction.

Answer

To change the products of the reaction.

Answer

To slow down the reaction.

Question 54

What is the key difference between a proton donor and a proton acceptor?

Accepted Answer

A proton donor releases a hydrogen ion (H+), while a proton acceptor accepts a hydrogen ion (H+).

Answer

A proton donor is a base, while a proton acceptor is an acid.

Answer

A proton donor is a weak acid, while a proton acceptor is a strong base.

Answer

A proton donor has a positive charge, while a proton acceptor has a negative charge.