Acids, Bases, and Salts: Interactive Learning Quizzes for Year 9 Science

Question 1

What type of chemical reaction occurs when an acid and a base interact?

Accepted Answer

Neutralization

Answer

Precipitation

Answer

Decomposition

Answer

Oxidation-reduction

Question 2

Which of these is classified as a strong acid?

Accepted Answer

Hydrochloric acid

Answer

Acetic acid

Answer

Carbonic acid

Answer

Citric acid

Question 3

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

Accepted Answer

7

Answer

0

Answer

14

Answer

Varies with temperature

Question 4

What is the term for the reaction between a base and an acid?

Accepted Answer

Neutralization

Answer

Oxidation

Answer

Reduction

Answer

Fermentation

Question 5

Which of these is an example of a weak base?

Accepted Answer

Ammonium hydroxide

Answer

Sodium hydroxide

Answer

Potassium hydroxide

Answer

Calcium hydroxide

Question 6

When a strong acid reacts with a strong base, what are the products?

Accepted Answer

A salt and water

Answer

A salt and a gas

Answer

A gas and water

Answer

No reaction occurs

Question 7

What is the chemical formula for sodium hydroxide?

Accepted Answer

NaOH

Answer

KOH

Answer

Ca(OH)2

Answer

NH4OH

Question 8

Which of the following is a characteristic property of acids?

Accepted Answer

Change the color of blue litmus paper to red

Answer

Feel slippery to the touch

Answer

Have a pH greater than 7

Answer

React with metals to produce carbon dioxide gas

Question 9

Which of these is a characteristic of acids?

Accepted Answer

Corrosive to metals

Accepted Answer

Neutralizes bases

Answer

Tasteless

Answer

Turns red litmus paper blue

Question 10

Which of the following is **not** a characteristic of acids?

Accepted Answer

Have a pH above 7

Answer

Corrosive

Answer

React with metals to produce hydrogen gas

Answer

Turn blue litmus paper red

Question 11

Which of the following compounds is a strong base?

Accepted Answer

Sodium hydroxide

Answer

Ammonium hydroxide

Answer

Calcium hydroxide

Answer

Magnesium hydroxide

Question 12

What is the conjugate base of hydrochloric acid (HCl)?

Accepted Answer

Cl-

Answer

H2O

Answer

OH-

Answer

H+

Question 13

Which acid is commonly found in vinegar?

Accepted Answer

Acetic acid

Answer

Hydrochloric acid

Answer

Nitric acid

Answer

Sulfuric acid

Question 14

Which of the following is an acid?

Accepted Answer

Hydrochloric acid

Answer

Sodium hydroxide

Answer

Potassium chloride

Answer

Copper oxide

Question 15

What is the pH value of a neutral solution?

Accepted Answer

7

Answer

0

Answer

14

Answer

28

Question 16

What is the conjugate acid of hydroxide ion?

Accepted Answer

Hydronium ion

Answer

Water

Answer

Sodium ion

Answer

Potassium ion

Question 17

Which of the following is a buffer solution?

Accepted Answer

A mixture of 0.1 M acetic acid and 0.1 M sodium acetate

Answer

Pure water

Answer

0.1 M HCl

Answer

0.1 M NaOH

Question 18

Which of these properties is a characteristic of acids?

Accepted Answer

Acids turn blue litmus paper red.

Accepted Answer

Acids react with metals to produce hydrogen gas.

Answer

Acids have a pH value greater than 7.

Answer

Acids feel slippery to the touch.

Question 19

Which property is unique to salts among the following?

Accepted Answer

Electrical conductivity when dissolved

Answer

Crystalline structure

Answer

High melting point

Answer

Neutral pH

Question 20

When sulfuric acid reacts with sodium hydroxide, what is the name of the salt formed?

Accepted Answer

Sodium sulfate

Answer

Sodium chloride

Answer

Potassium sulfate

Answer

Magnesium sulfate

Question 21

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

Accepted Answer

To indicate the equivalence point of the reaction

Answer

To calculate the volume of acid used

Answer

To neutralize the solution

Answer

To prevent the formation of unwanted gases

Question 22

Which of the following reactions demonstrates neutralization?

Accepted Answer

Acid + Base → Salt + Water

Answer

Acid + Metal → Salt + Hydrogen

Answer

Base + Metal → Salt + Hydrogen

Answer

Salt + Acid → Base + Water

Question 23

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 24

Which of the following is considered a weak acid?

Accepted Answer

Acetic acid

Answer

Hydrochloric acid

Answer

Sulfuric acid

Answer

Nitric acid

Question 25

What is the conjugate base of a weak acid?

Accepted Answer

A weak base

Answer

A strong base

Answer

A neutral substance

Answer

An acid

Question 26

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

Accepted Answer

To change color at a specific pH value

Answer

To neutralize the acid or base

Answer

To speed up the reaction

Answer

To measure the volume of the solution

Question 27

In a titration experiment, what is the primary function of an indicator, and how does it aid in determining the endpoint?

Accepted Answer

An indicator signals the completion of the reaction through a visible change.

Answer

An indicator ensures the solution is neutral before titration.

Answer

An indicator prevents unwanted reactions during the experiment.

Answer

An indicator can replace a burette in the experiment.

Question 28

What is the pH range for a neutral solution?

Accepted Answer

7

Answer

0-6

Answer

6-8

Answer

8-14

Question 29

What type of chemical reaction takes place when acid reacts with a base?

Accepted Answer

Acid-base reaction

Answer

Redox reaction

Answer

Precipitation reaction

Answer

Combustion reaction

Question 30

What is the conjugate base of hydronium ion (H3O+)?

Accepted Answer

Hydroxide ion

Answer

Water

Answer

Sodium ion

Answer

Chloride ion

Question 31

What is the chemical formula for calcium sulfate?

Accepted Answer

CaSO4

Answer

CaS2O4

Answer

CaSO3

Answer

Ca2SO4

Question 32

What is the chemical formula for hydrochloric acid?

Accepted Answer

HCl

Answer

H2SO4

Answer

HNO3

Answer

CH3COOH

Question 33

Which of the following substances can effectively neutralize an acid?

Accepted Answer

A base

Answer

A salt

Answer

A metal

Answer

A non-metal

Question 34

When sodium hydroxide reacts with sulfuric acid, what is the name of the salt produced?

Accepted Answer

Sodium sulfate

Answer

Sodium hydrogen sulfate

Answer

Sodium hydroxide sulfate

Answer

Sulfuric acid sodium

Question 35

Identify the substance that is classified as a base:

Accepted Answer

Sodium hydroxide

Answer

Carbon dioxide

Answer

Salt water

Answer

Hydrochloric acid

Question 36

What is the pH value of a neutral solution?

Accepted Answer

7

Answer

14

Answer

0

Answer

11

Question 37

Which reaction represents an example of a redox reaction?

Accepted Answer

Acid + metal → salt + hydrogen

Answer

Base + metal → salt + water

Answer

Salt + water → acid + base

Answer

Acid + base → salt + water

Question 38

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

Accepted Answer

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

Answer

Strong acids have a lower pH than weak acids.

Answer

Weak acids are corrosive, while strong acids are not.

Question 39

Which of the following substances is classified as a salt?

Accepted Answer

Sodium chloride

Answer

Glucose

Answer

Carbon dioxide

Answer

Hydrochloric acid

Question 40

Identify the acid present in vinegar:

Accepted Answer

Acetic acid

Answer

Hydrochloric acid

Answer

Sulfuric acid

Answer

Nitric acid

Question 41

Calculate the molarity of a solution containing 0.2 moles of solute dissolved in 2 liters of solution:

Accepted Answer

0.1 M

Answer

1 M

Answer

0.01 M

Question 42

Which of the following is NOT a characteristic of acids?

Accepted Answer

They have a bitter taste.

Answer

They can neutralize bases.

Answer

They react with metals to produce hydrogen gas.

Answer

They turn blue litmus paper red.

Question 43

What is the pH range for strong acids?

Accepted Answer

0-2

Answer

4-6

Answer

6-8

Answer

10-14

Question 44

Which of the following is an example of a strong base?

Accepted Answer

Sodium hydroxide (NaOH)

Answer

Baking soda

Answer

Lemon juice

Answer

Vinegar

Question 45

What is the chemical formula for the salt formed when hydrochloric acid (HCl) reacts with sodium hydroxide (NaOH)?

Accepted Answer

NaCl

Answer

H2O

Answer

HClO

Answer

Na2O

Question 46

A student wants to neutralize a solution of hydrochloric acid (HCl). Which of the following could they use?

Accepted Answer

Sodium hydroxide (NaOH)

Answer

More hydrochloric acid (HCl)

Answer

Water (H2O)

Answer

Sugar (C12H22O11)

Question 47

A solution with a pH of 3 is considered to be:

Accepted Answer

Acidic

Answer

Basic

Answer

Neutral

Answer

None of the above

Question 48

What is the role of an indicator in acid-base reactions?

Accepted Answer

To indicate the presence of an acid or a base by changing colour.

Answer

To speed up the reaction.

Answer

To neutralize the acid or base.

Question 49

Which of the following is a common salt used in cooking?

Accepted Answer

Sodium chloride (NaCl)

Answer

Magnesium sulfate (MgSO4)

Answer

Potassium nitrate (KNO3)

Answer

Calcium carbonate (CaCO3)

Question 50

What is the name of the reaction that occurs when an acid and a base react?

Accepted Answer

Neutralization

Answer

Combustion

Answer

Decomposition