Question 1

What is the pH range of acids?

Accepted Answer

0 to 6

Answer

7 to 14

Answer

-1 to 1

Answer

8 to 10

Question 2

Which of the following is a common property of acids?

Accepted Answer

They taste sour

Answer

They taste sweet

Answer

They conduct electricity poorly

Answer

They are slippery

Question 3

What is a common strong acid?

Accepted Answer

Hydrochloric acid

Answer

Acetic acid

Answer

Boric acid

Answer

Citric acid

Question 4

Which of the following is NOT an acid?

Accepted Answer

Sodium bicarbonate

Answer

Sulfuric acid

Answer

Phosphoric acid

Answer

Nitric acid

Question 5

What does an indicator show by means of a colour change?

Accepted Answer

Whether a substance is acidic or basic

Answer

The temperature of a gas

Answer

The boiling point of a substance

Answer

The density of a liquid

Question 6

What colour does litmus turn in the presence of an acid?

Accepted Answer

Red

Answer

Green

Answer

Yellow

Answer

Blue

Question 7

How does litmus react with a base?

Accepted Answer

Turns blue

Answer

Stays red

Answer

Turns purple

Answer

Turns orange

Question 8

What does it mean if there is no colour change in an indicator?

Accepted Answer

The substance is neutral

Answer

The substance is boiling

Answer

The substance is toxic

Answer

The substance is flammable

Question 9

What type of chemical is litmus classified as?

Accepted Answer

Acid-base indicator

Answer

Reagent

Answer

Solvent

Answer

Catalyst

Question 10

What is the chemical opposite of an acid?

Accepted Answer

a base

Answer

a compound

Answer

a salt

Answer

an alkali

Question 11

What do we call bases that dissolve in water?

Accepted Answer

alkalis

Answer

acids

Answer

neutrals

Answer

salts

Question 12

Which of the following is an example of a base?

Accepted Answer

NaOH

Answer

HCl

Answer

KCl

Answer

NH4Cl

Question 13

Which of the following bases is generally harmless?

Accepted Answer

toothpaste

Answer

calcium carbonate

Answer

ammonium hydroxide

Answer

sodium hydroxide

Question 14

What can some bases be described as?

Accepted Answer

dangerous

Answer

sweet

Answer

edible

Answer

odorless

Question 15

Which of the following is considered a strong base?

Accepted Answer

NaOH

Answer

vinegar

Answer

baking soda

Answer

citric acid

Question 16

What do bases do in relation to acids?

Accepted Answer

neutralize them

Answer

make them volatile

Answer

dissolve them

Answer

increase their strength

Question 17

What pH value indicates a neutral solution?

Accepted Answer

7

Answer

4

Answer

10

Answer

0

Question 18

If a solution has a pH of 3, how would you classify it?

Accepted Answer

Acidic

Answer

Basic

Answer

Strongly basic

Answer

Neutral

Question 19

What happens to the acidity of a solution as the pH value decreases below 7?

Accepted Answer

It becomes more acidic

Answer

It becomes neutral

Answer

It becomes basic

Answer

It becomes less acidic

Question 20

What is the highest value on the pH scale?

Accepted Answer

14

Answer

0

Answer

7

Answer

10

Question 21

Which of the following has a pH value that is considered basic?

Accepted Answer

8

Answer

6

Answer

7

Answer

5

Question 22

What pH level would a strongly acidic solution have?

Accepted Answer

Below 3

Answer

5

Answer

6

Answer

7

Question 23

What is the significance of a pH value of 7 in terms of acidity and basicity?

Accepted Answer

It is neutral

Answer

It is basic

Answer

It is strongly basic

Answer

It is acidic

Question 24

If a liquid has a pH of 10, how is it classified?

Accepted Answer

Basic

Answer

Acidic

Answer

Neutral

Answer

Slightly acidic

Question 25

As the pH value increases above 7, what happens to the basicity of a solution?

Accepted Answer

It increases

Answer

It decreases

Answer

It remains the same

Answer

It becomes acidic

Question 26

What pH level is typical for a neutral solution in biological systems?

Accepted Answer

7

Answer

9

Answer

5

Answer

6

Question 27

What is the purpose of a universal indicator?

Accepted Answer

It changes colour based on the pH of a solution.

Answer

It indicates the density of a solution.

Answer

It determines the color of a solution.

Answer

It measures temperature of a solution.

Question 28

What colour does a universal indicator show for a neutral pH?

Accepted Answer

Green

Answer

Blue

Answer

Red

Answer

Yellow

Question 29

In which forms can universal indicator be used?

Accepted Answer

Liquid or paper form

Answer

Gas or solid form

Answer

Only liquid form

Answer

Only paper form

Question 30

What colour indicates a low pH on the universal indicator scale?

Accepted Answer

Red

Answer

Blue

Answer

Green

Answer

Purple

Question 31

What is the approximate pH of a solution that appears purple with the universal indicator?

Accepted Answer

High pH

Answer

Low pH

Answer

Moderate pH

Answer

Neutral pH

Question 32

How does the universal indicator visually represent different pH levels?

Accepted Answer

Using a colour chart

Answer

Using a numerical scale

Answer

Using texture changes

Answer

Using temperature readings

Question 33

What colour would a strongly basic solution show on a universal indicator?

Accepted Answer

Purple

Answer

Red

Answer

Green

Answer

Yellow

Question 34

What does it mean if a solution shows a transition from red to green on the universal indicator?

Accepted Answer

The pH is increasing towards neutral.

Answer

The solution is turning into a solid.

Answer

The solution is becoming more acidic.

Answer

The solution is boiling.

Question 35

Which of the following is a characteristic of universal indicators?

Accepted Answer

They provide a visual representation of pH.

Answer

They can detect temperature changes.

Answer

They only work in basic solutions.

Answer

They can identify specific compounds.

Question 36

What is the primary function of a pH sensor?

Accepted Answer

To measure pH

Answer

To measure salinity

Answer

To measure pressure

Answer

To measure temperature

Question 37

Where is the probe of a pH sensor inserted?

Accepted Answer

Into the solution to be tested

Answer

Into a gas

Answer

Into a solid

Answer

Into the air

Question 38

How is the pH reading displayed after testing?

Accepted Answer

On a computer or smartphone

Answer

On a piece of paper

Answer

On a television screen

Answer

On a digital clock

Question 39

Which of the following is essential for a pH sensor to function?

Accepted Answer

A probe

Answer

A thermometer

Answer

A battery

Answer

A scale

Question 40

What is the pH scale used for?

Accepted Answer

To indicate acidity or alkalinity

Answer

To measure density

Answer

To measure volume

Answer

To measure temperature

Question 41

What is the typical range of the pH scale?

Accepted Answer

0 to 14

Answer

0 to 100

Answer

-1 to 1

Answer

1 to 10

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