Acids, Bases, and Salts: Interactive Learning Quizzes for Year 7 Science

Question 1

Which of the following is an example of a neutralization reaction?

Accepted Answer

Hydrochloric acid + sodium hydroxide --> sodium chloride + water

Answer

Hydrogen + oxygen --> water

Answer

Iron + copper sulfate --> iron sulfate + copper

Answer

Magnesium + hydrochloric acid --> magnesium chloride + hydrogen

Question 2

What is the pH of a neutral solution?

Accepted Answer

7

Answer

0

Answer

14

Answer

10

Question 3

What type of substance can behave as both an acid and a base?

Accepted Answer

Amphoteric substance

Answer

Salt

Answer

Alkali

Answer

Neutral substance

Question 4

Acids have a sour taste. Which other characteristic is also true of acids?

Accepted Answer

React with metals to produce hydrogen gas

Answer

Turn litmus paper blue

Answer

Feel slippery

Answer

Taste sweet

Question 5

Which of the following is a type of base?

Accepted Answer

Alkali

Answer

Metal

Answer

Salt

Answer

Acid

Question 6

When an acid reacts with a base, what is formed?

Accepted Answer

Water and a salt

Answer

Oxygen and a metal

Answer

Hydrogen and a metal oxide

Answer

Neutralizes each other

Question 7

Which of the following is a weak acid?

Accepted Answer

Acetic acid (CH3COOH)

Answer

Hydrochloric acid (HCl)

Answer

Sulfuric acid (H2SO4)

Answer

Nitric acid (HNO3)

Question 8

What is the conjugate base of HCl?

Accepted Answer

Cl-

Answer

H+

Answer

H2O

Answer

OH-

Question 9

What is the formula of the salt formed when sulfuric acid (H2SO4) reacts with sodium hydroxide (NaOH)?

Accepted Answer

Na2SO4

Answer

NaSO4

Answer

Na2SO3

Answer

HNaSO4

Question 10

Which substance is an acid?

Accepted Answer

Hydrochloric acid

Answer

Sodium hydroxide

Answer

Potassium chloride

Answer

Calcium carbonate

Question 11

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

Accepted Answer

A salt and water

Answer

An acid

Answer

A base

Answer

A metal and a gas

Question 12

Which substance is classified as a salt?

Accepted Answer

Sodium chloride

Answer

Acetic acid

Answer

Magnesium hydroxide

Answer

Carbon dioxide

Question 13

What is the pH of a neutral solution?

Accepted Answer

7

Answer

0

Answer

14

Answer

10

Question 14

Which reaction produces a gas?

Accepted Answer

Acid + metal

Answer

Acid + base

Answer

Base + metal

Answer

Salt + water

Question 15

What is the name of the compound formed when sodium reacts with chlorine?

Accepted Answer

Sodium chloride

Answer

Hydrogen chloride

Answer

Sodium hydroxide

Answer

Chlorine gas

Question 16

A student adds an acid to a solution and the litmus paper turns red. What does this indicate about the solution?

Accepted Answer

The solution is acidic

Answer

The solution is basic

Answer

The solution is neutral

Answer

The litmus paper is not working properly

Question 17

What is the numerical value of the pH of a neutral solution?

Accepted Answer

7

Answer

0

Answer

14

Answer

10

Question 18

Which of these substances is a base?

Accepted Answer

Sodium hydroxide

Answer

Hydrochloric acid

Answer

Carbon dioxide

Answer

Water

Question 19

What is the main product formed when an acid reacts with a base?

Accepted Answer

A salt

Answer

A gas

Answer

A precipitate

Answer

A metal

Question 20

Which of the following is an example of a salt?

Accepted Answer

Sodium chloride

Answer

Potassium hydroxide

Answer

Sulfuric acid

Answer

Carbonic acid

Question 21

How do strong acids differ from weak acids?

Accepted Answer

Strong acids ionize completely in water, while weak acids ionize partially.

Answer

Weak acids ionize completely in water, while strong acids ionize partially.

Answer

Strong acids have a higher pH than weak acids.

Answer

Weak acids have a higher pH than strong acids.

Question 22

What is the pH of a solution with a hydrogen ion concentration of 1 x 10^-7 mol/dm³?

Accepted Answer

7

Answer

4

Answer

10

Answer

14

Question 23

Which of the following reactions is a neutralization reaction?

Accepted Answer

Acid + Base → Salt + Water

Answer

Metal + Acid → Salt + Hydrogen

Answer

Base + Metal → Salt + Hydrogen

Answer

Acid + Metal → Salt + Water

Question 24

What is the chemical formula of hydrochloric acid?

Accepted Answer

HCl

Answer

NaOH

Answer

H2SO4

Answer

KOH

Question 25

Which substance contains hydrogen ions (H+) and has a pH less than 7?

Accepted Answer

Vinegar

Answer

Baking soda

Answer

Salt

Answer

Sugar

Question 26

What is the value of pH for a solution that is neither acidic nor basic?

Accepted Answer

7

Answer

0

Answer

14

Answer

28

Question 27

Which of the following reactions represents a neutralization reaction?

Accepted Answer

Acid + Base → Salt + Water

Answer

Acid + Metal → Salt + Hydrogen

Answer

Base + Metal → Salt + Hydrogen

Answer

Salt + Water → Acid + Base

Question 28

What is the main product formed when sodium hydroxide reacts with hydrochloric acid?

Accepted Answer

Sodium chloride

Answer

Sodium oxide

Answer

Hydrochloric acid

Answer

Water

Question 29

Which acid is considered a strong acid?

Accepted Answer

Hydrochloric acid

Answer

Acetic acid

Answer

Carbonic acid

Answer

Phosphoric acid

Question 30

Which substance is a weak base?

Accepted Answer

Ammonium hydroxide

Answer

Sodium hydroxide

Answer

Potassium hydroxide

Answer

Calcium hydroxide

Question 31

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

Accepted Answer

Sulfate ion

Answer

Hydroxide ion

Answer

Water

Answer

Hydrogen ion

Question 32

A substance with a pH of 9 is considered:

Accepted Answer

Basic

Answer

Acidic

Answer

Neutral

Answer

Amphoteric

Question 33

When a metal reacts with an acid, the resulting compound is a:

Accepted Answer

Salt

Answer

Base

Answer

Acid

Answer

Water

Question 34

Which of the following acids is considered a strong acid?

Accepted Answer

Hydrochloric acid

Answer

Citric acid

Answer

Acetic acid

Answer

Carbonic acid

Question 35

What is the chemical formula for sodium hydroxide?

Accepted Answer

NaOH

Answer

KOH

Answer

Ca(OH)2

Answer

Mg(OH)2

Question 36

Which of the following bases is considered a weak base?

Accepted Answer

Ammonium hydroxide

Answer

Sodium hydroxide

Answer

Potassium hydroxide

Answer

Calcium hydroxide

Question 37

Which of the following is a base?

Accepted Answer

Sodium hydroxide

Answer

Hydrochloric acid

Answer

Salt

Answer

Water

Question 38

What is the pH of a neutral solution?

Accepted Answer

7

Answer

0

Answer

14

Answer

2

Question 39

Which of the following reactions is a neutralisation reaction?

Accepted Answer

Acid + Base -> Salt + Water

Answer

Acid + Metal -> Salt + Hydrogen

Answer

Base + Metal -> Salt + Hydrogen

Answer

Salt + Water -> Acid + Base

Question 40

Which of the following is a weak acid?

Accepted Answer

Citric acid

Answer

Hydrochloric acid

Answer

Sulfuric acid

Answer

Nitric acid

Question 41

Which of the following metals reacts with acids to produce hydrogen gas?

Accepted Answer

Iron

Answer

Copper

Answer

Gold

Answer

Silver

Question 42

Identify the acid: Hydrochloric acid or Sodium hydroxide?

Accepted Answer

Hydrochloric acid

Answer

Sodium hydroxide

Question 43

Which substance is a base?

Accepted Answer

Sodium hydroxide

Answer

Citric acid

Question 44

What is the correct type of Sodium chloride?

Accepted Answer

Salt

Answer

Acid

Question 45

What will be the pH value of an acidic solution?

Accepted Answer

Less than 7

Answer

Equal to 7

Question 46

What is the pH of a basic solution?

Accepted Answer

Greater than 7

Answer

Less than 7

Question 47

Identify the strong acid?

Accepted Answer

Sulphuric acid

Answer

Acetic acid

Question 48

Which substance is a weak base?

Accepted Answer

Ammonia

Answer

Sodium hydroxide

Question 49

Explain the difference between an acid and a base

Accepted Answer

Acid donates protons while base accepts protons

Answer

Base donates protons while acid accepts protons

Question 50

Which of the following is a strong base?

Accepted Answer

Sodium hydroxide

Answer

Ammonia

Answer

Carbon dioxide

Answer

Water

Question 51

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

Accepted Answer

A salt and water

Answer

A precipitate and a gas

Answer

A color change

Answer

No reaction occurs

Question 52

What is the name of the salt formed when hydrochloric acid reacts with sodium hydroxide?

Accepted Answer

Sodium chloride

Answer

Potassium chloride

Answer

Calcium chloride

Answer

Magnesium chloride

Question 53

Which of the following is a weak acid?

Accepted Answer

Acetic acid

Answer

Hydrochloric acid

Answer

Sulfuric acid

Answer

Nitric acid

Question 54

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

Accepted Answer

A strong acid dissociates completely in water, while a weak acid dissociates partially.

Answer

A weak acid is more corrosive than a strong acid.

Answer

A strong acid has a higher pH than a weak acid.

Answer

There is no difference between a strong acid and a weak acid.

Question 55

What is the process by which water molecules surround and separate the ions of a salt?

Accepted Answer

Hydration

Answer

Neutralization

Answer

Dissociation

Answer

Ionization

Question 56

Which of the following is NOT a characteristic of a salt?

Accepted Answer

Tastes sweet

Answer

Solid at room temperature

Answer

Conducts electricity when dissolved in water

Answer

Formed by the reaction of an acid and a base

Question 57

What is the pH range for a neutral solution?

Accepted Answer

7

Answer

0-6

Answer

6-8

Answer

8-14

Question 58

What is the chemical reaction between an acid and a base called?

Accepted Answer

Neutralization

Answer

Oxidation

Answer

Reduction

Answer

Combustion

Question 59

What is the chemical formula for sulfuric acid?

Accepted Answer

H2SO4

Answer

HCl

Answer

HNO3

Answer

NaOH

Question 60

Which of the following is considered a weak acid?

Accepted Answer

Acetic acid (CH3COOH)

Answer

Hydrochloric acid (HCl)

Answer

Nitric acid (HNO3)

Answer

Sulfuric acid (H2SO4)