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C7 Acids, bases & Salts

Total questions: 60

Worksheet time: 37mins

Name
Class
Date
1.
Which of the following is the best definition of a soluble salt?
a)
A salt that dissolves in water to form a solution.
b)
A salt that does not dissolve in water.
c)
A salt that is insoluble in all solvents.
d)
A salt that reacts with water to form a gas.
2.

What process is used to prepare a soluble salt by reacting an acid with an alkali?

a)
Titration
b)
Precipitation
c)
Filtration
d)
Distillation
3.
Which of the following is a hydrated substance?
a)
Iron oxide
b)
Copper(II) sulfate pentahydrate
c)
Sodium chloride
d)
Calcium carbonate
4.
What is the difference between a hydrated substance and an anhydrous substance?
a)
A hydrated substance is an acid, while an anhydrous substance is a base.
b)
A hydrated substance is soluble in water, while an anhydrous substance is not.
c)
A hydrated substance is a liquid, while an anhydrous substance is a solid.
d)
A hydrated substance contains water chemically bound to its structure, while an anhydrous substance does not.
5.
Which of the following methods is used to prepare an insoluble salt?
a)
Distillation
b)
Crystallization
c)
Precipitation
d)
Titration
6.

When preparing a soluble salt by reacting an acid with an excess insoluble base, what is the purpose of using an excess base?

a)
To speed up the reaction.
b)
To neutralize the acid.
c)
To make the salt more soluble.
d)
To ensure all the acid has reacted.
7.
What is the name of the process used to remove the excess insoluble base after the reaction with an acid?
a)
Evaporation
b)
Distillation
c)
Crystallization
d)
Filtration
8.
How is the soluble salt obtained after the reaction of an acid with an excess metal?
a)
The solution is neutralized with an alkali and then evaporated.
b)
The excess metal is filtered off and the solution is evaporated to crystallize the salt.
c)
The solution is distilled to separate the salt from the water.
d)
The salt precipitates out of solution and is filtered off.
9.
In a precipitation reaction, how can you tell that an insoluble salt has formed?
a)
A gas will be produced.
b)
A precipitate (solid) will form in the solution.
c)
The solution will get hot.
d)
The solution will change color.
10.
Which of the following is NOT a method for purifying a soluble salt?
a)
Washing with cold distilled water
b)
Drying in a warm oven
c)
Recrystallization
d)
Titration
11.

What is an oxide?

a)

A compound that dissolves in water.

b)

A compound containing hydrogen and oxygen.

c)

A compound formed between two metals.

d)

A compound formed between an element and oxygen.

12.

Which of the following is a basic oxide?

a)

CO2

b)

Al2O3

c)

SO2

d)

CaO

13.

Which of the following is an acidic oxide?

a)

CuO

b)

ZnO

c)

CO2

d)

Na2O

14.

Oxides of non-metals are usually:

a)

acidic

b)

basic

c)

amphoteric

d)

neutral

15.

Oxides of metals are usually

a)

basic

b)

neutral

c)

amphoteric

d)

acidic

16.

Which of the following oxides reacts with both acids and bases to produce salt and water?

a)

SO2

b)

CuO

c)

Al2O3

d)

K2O

17.

Which of the following best describes amphoteric oxides?

a)

They only react with acids.

b)

They only react with bases.

c)

They can react with both acids and bases.

d)

They do not react with acids or bases.

18.

Which of the following is an amphoteric oxide?

a)

CaO

b)

ZnO

c)

SO2

d)

CO2

19.

When an amphoteric oxide reacts with an acid, it behaves as a:

a)

Neutral compound

b)

Acidic oxide

c)

Basic oxide

d)

Salt

20.

When aluminum oxide (Al2O3) reacts with sodium hydroxide (NaOH) solution, it forms sodium aluminate (NaAlO2) and water (H2O).

Al2O3 (s) + 2NaOH (aq) → 2NaAlO2 (aq) + H2O (l)

In this reaction, Al2O3 acts as

a)

a neutral compound

b)

a basic oxide

c)

an acidic oxide

d)

a base solution

21.

Which of the following is NOT a property of acids?

a)

They react with metals to produce hydrogen gas.

b)

They react with bases to form salt and water.

c)

They feel slippery.

d)

They turn blue litmus paper red.

22.

Which of the following is/are base(s) ?

(Choose ALL that apply)

a)

KCl

b)

CO2

c)

NaOH

d)

Ca(OH)2

e)

H2SO4

23.

What is the difference between a base and an alkali?

a)

There is no difference between a base and an alkali.

b)

An alkali is a base that is soluble in water.

c)

Bases are oxides or hydroxides of non-metals, while alkalis are oxides or hydroxides of metals.

d)

A base is a substance that releases hydroxide ions (OH-) in solution, while an alkali releases hydrogen ions (H+).

24.

What color does blue litmus paper turn in the presence of an acid?

a)

red

b)

blue

c)

yellow

d)

green

e)

colorless

25.

What color does red litmus paper turn in the presence of a base?

a)

red

b)

blue

c)

yellow

d)

green

e)

colorless

26.

Which of the following is a characteristic property of bases?

a)

They have a sour taste.

b)

They turn blue litmus paper red.

c)

They react with metals to produce hydrogen gas.

d)

They react with acids to form salt and water.

27.

What is the pH of a neutral solution?

a)

14

b)

7

c)

1

d)

9

e)

3

28.

Which of the following pH values indicates an acidic solution?

a)

14

b)

7

c)

10

d)

3

e)

12

29.

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

a)

Base and water

b)

Acid and water

c)

Salt and hydrogen gas

d)

Salt and water

30.

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

a)

Base and water

b)

Salt, water, and carbon dioxide gas

c)

Acid and water

d)

Salt and water

31.

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

a)

Zn + 2HCl → ZnCl2 + H2

b)

CaCO3 + 2HCl → CaCl2 + H2O + CO2

c)

HCl + NaOH → NaCl + H2O

d)

2H2O → 2H2 + O2

32.

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

a)

They feel soapy.

b)

They have a sour taste.

c)

They turn red litmus paper blue.

d)

They react with acids.

33.

What type of reaction occurs when an acid reacts with a base?

a)

Decomposition

b)

Oxidation

c)

Reduction

d)

Neutralization

34.

Which property is not characteristic of a base?

a)

A It reacts with a carbonate to form carbon dioxide.

b)

B It reacts with an acid to form a salt.

c)

C It reacts with an ammonium salt to form ammonia.

d)

D It turns universal indicator paper blue.

35.

Hydrochloric acid is used to clean metals. The acid reacts with the oxide layer on the surface of the metal, forming a salt and water.

Which word describes the metal oxide?

a)

A alloy

b)

B base

c)

C element

d)

D indicator

36.

Which equation for the reaction between sodium carbonate and dilute hydrochloric acid is correct?

a)

A Na2CO3(s) + HCl(aq) → NaCl(aq) + CO2(g) + H2O(I)

b)

B Na2CO3(s) + HCl(aq) → Na2Cl(aq) + CO2(g) + H2O(I)

c)

C Na2CO3(s) + 2HCl(aq) → NaCl(aq) + CO2(g) + H2O(I)

d)

D Na2CO3(s) + 2HCl(aq) → 2NaCl(aq) + CO2(g) + H2O(I)

37.

Three chemicals, P, Q and R, were each dissolved in water. The table shows some of the reactions of these solutions.

The pH of the three solutions was also measured.

What are the correct pH values of these solutions?

a)

A P = 2; Q = 7; R = 13

b)

B P = 2; Q = 1; R = 7

c)

C P = 7; Q = 2; R = 13

d)

D P = 13; Q = 7; R = 2

38.

Which substance is the most acidic?

a)

A

b)

B

c)

C

d)

D

39.

The graph shows how the pH of soil in a field changes over time. At which point was the soil neutral?

a)

A

b)

B

c)

C

d)

D

40.

Which statements about alkalis are correct?

1 When reacted with an acid, the pH of the alkali increases.

2 When tested with litmus, the litmus turns blue.

3 When warmed with an ammonium salt, ammonia gas is given off.

a)

A 1, 2 and 3

b)

B 1 and 2 only

c)

C 1 and 3 only

d)

D 2 and 3 only

41.

Which statements about alkalis are correct?

1 When reacted with an acid, the pH of the alkali increases.

2 When tested with litmus, the litmus turns blue.

3 When warmed with an ammonium salt, ammonia gas is given off.

a)

A 1, 2 and 3

b)

B 1 and 2 only

c)

C 1 and 3 only

d)

D 2 and 3 only

42.

Carbon dioxide is produced when:

X reacts with ethanol.

Y reacts with sodium carbonate.


What are X and Y?

a)

A

b)

B

c)

C

d)

D

43.
sodium hydrogen carbonate when added to acetic acid evolves  a gas .which of the statement is true about the gas evolved
a)
it turns lime water milky
b)
it burns with a pop sound
c)
it changes the soln colorless
d)
it has a pungent smell
44.

A lighted splint was held over a flask in which a gas was given off. The splint went out with a pop. Which gas was given off?

a)

hydrogen

b)

chlorine

c)

oxygen

d)

ammonia

45.

________________ is an example of an amphoteric oxide

a)

aluminium oxide

b)

carbon dioxide

c)

sulphur dioxide

d)

copper oxide

46.

Which of the following word pairs, correctly completes the sentence below? _______ are corrosive substances characterized as having a strong smell, a sour taste, and a _______.

a)
Acids; pH less than 7
b)
Acids; pH greater than 7
c)
Bases; pH greater than 7
d)
Bases; pH less than 7
47.

If a few drops of concentrated acid accidentally spills over the hand of a student, what should be done

a)
wash the hand with saline solution
b)
wash the hand immediately with plenty of water and apply a soln of sodium hydrogen carbonate
c)
after washing apply soln of sodium hydroxide
d)
neutralise the acid wih a strong alkali
48.

Precipitation involves mixing ___________ to form an insoluble solid that separates out from the reaction mixture.

a)

acid and alkali

b)

acid and metal

c)

two acids

d)

two solutions

49.
An acid reacts with a metal carbonate to produce 
a)
Salt, water and hydrogen gas
b)
Salt, water and carbon dioxide
c)
Limewater
d)
Salt and water 
50.
Complete the following reaction:
Hydrochloric acid + magnesium hydroxide --> 
a)
Magnesium chloride + water 
b)
Magnesium + water
c)
Magnesium chloride + hydrogen gas 
d)
Magnesium chloride + water + carbon dioxide 
51.
Pure water is _______ on the pH scale.
a)
Acid
b)
Base
c)
Neutral
52.

Hydrochloric acid + sodium hydroxide → sodium chloride + water

a)

This reaction is a neutralisation reaction

b)

This reaction is a combustion reaction

c)

This reaction is an oxidation reaction

d)

This reaction is salty

53.
Salts that are made with hydrochloric acid are called ______________.
a)
chlorides
b)
sulfates
c)
nitrates
d)
carbonates
54.
Salts that are made with sulfuric acid are called ______________.
a)
chlorides
b)
sulfates
c)
nitrates
d)
carbonates
55.
Salts that are made with nitric acid are called ______________.
a)
chlorides
b)
sulfates
c)
nitrates
d)
carbonates
56.
Identify the 'evaporating basin' from the diagrams.
a)
A
b)
B
c)
C
d)
D
57.

An aqueous solution of NaCl can turn red litmus into-

a)

Blue

b)

Color remains same that is red

c)

Changed to purple

d)

None

58.

Acid secreted by our body (stomach) for digestion of food is-

a)

Concentrated Hydrochloric acid

b)

dilute Acetic acid

c)

dilute Hydrochloric acid

d)

Concentrated Sulphuric acid

59.

What acid is needed to make copper nitrate?

a)

Hydrochloric

b)

Nitric

c)

Sulfuric

d)

Phosphoric

60.

Which is the correct sequence of steps to make a pure sample of a soluble salt?

a)

Add excess acid to base, filter acid, evaporate half of solution, leave to crystallise, remove crystals and dry them with filter paper.

b)

Mix two soluble solutions and filter off the insoluble salt. Dry the salt.

c)

Add excess base to acid, filter excess base, evaporate half of solution, leave to crystallise, remove crystals and dry them with filter paper.

d)

Add UI to acid and add base until UI turns green. Evaporate half of solution, leave to crystallise, remove crystals and dry them with filter paper.

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