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Essential Chemistry for IGCSE - Acids And Bases (Section 3)

1
Which of the following is considered a base?
Answer
A
B
2
What is the role of an alkali in soil?
Answer
(B)
To decrease the acidity of the soil.
3
What is the name given to an oxide that reacts with both acids and bases?
Answer
(C)
Amphoteric oxide
4
What are the products of a strong acid with a base
Answer
A
B
5
What color would red litmus paper turn in an alkaline solution?
Answer
(A)
Blue
6
Which of the following reactions release carbon dioxide gas?
Answer
(B)
Acid + carbonate
7
Which of the following is a characteristic of bases?
Answer
A
B
C
8
What type of oxide is formed when a non-metal reacts with oxygen?
Answer
(A)
Acidic oxide
9
What is the conjugate base of HCl?
Answer
(B)
Cl⁻
10
What is the definition of pOH?
Answer
(B)
The negative logarithm of the hydroxide ion concentration.
11
When a base dissolves in water, what happens to the concentration of hydroxide ions (OH⁻)?
Answer
(B)
It increases.
12
What is an acid according to the Lewis definition?
Answer
(D)
Electron pair acceptor
13
What is the pH of a 0.1M solution of HCl?
Answer
(A)
1
14
What happens to the concentration of H+ ions in an acidic solution?
Answer
(A)
Increases
15
What is the role of a base in neutralization?
Answer
(B)
To accept protons
16
Which ion is present in bases?
Answer
(B)
OH-
17
Which gas is released when an acid reacts with a carbonate?
Answer
(C)
Carbon dioxide
18
Which of the following will be a strong electrolyte?
Answer
(C)
A strong acid.
19
What is the primary function of a buffer solution?
Answer
(C)
To resist changes in pH
20
What does a higher pH value indicate about a solution?
Answer
(B)
Less acidic
21
Which of the following is a characteristic of a base?
Answer
(C)
Feels soapy.
22
What is the most important indicator of acidity or basicity of a solution?
Answer
(C)
pH
23
What does a high concentration of H+ ions indicate about a solution?
Answer
(B)
Acidic
24
What is a property of an alkaline solution?
Answer
(D)
Feels soapy
25
What is the pH range for an acidic solution?
Answer
(D)
1-6.9
26
If a solution turns red litmus paper blue, what is the nature of the solution?
Answer
(B)
Basic
27
What are the products when an acid reacts with a base in a neutralization reaction?
Answer
(A)
Salt and water
28
What is the pH of a neutral solution at 25°C?
Answer
(B)
7
29
Which gas is released when an acid reacts with a metal?
Answer
(C)
Hydrogen
30
What type of reaction is the reaction between an acid and a base?
Answer
(C)
Neutralization
31
What is a proton?
Answer
(B)
A hydrogen ion
32
A student tests a solution using a universal indicator and observes that the color turns green. What can the student conclude about the solution?
Answer
(C)
The solution is neutral.
33
What type of reaction occurs between an acid and a base?
Answer
(C)
Neutralization
34
Which of the following indicators would be best to use to determine if a solution is strongly acidic?
Answer
(B)
Methyl orange
35
Which of the following is an example of a base?
Answer
(C)
Sodium hydroxide
36
Which type of oxides react with water to form acids?
Answer
(B)
Acidic oxides
37
What gas is released when acids react with carbonates?
Answer
(C)
Carbon Dioxide
38
Which of the following oxides would react with water to form an acid?
Answer
(B)
SO3
39
Which of the following is an example of an alkali?
Answer
(B)
Sodium hydroxide
40
What color does litmus paper turn in an alkaline solution?
Answer
(B)
Blue
41
Which of the following is an example of an acidic oxide?
Answer
(B)
CO2
42
What products are formed when a base reacts with an acid?
Answer
(B)
Salt and water
43
What do acids taste like?
Answer
(C)
Sour
44
What is formed when an alkali is added to ammonium sulfate solution?
Answer
(C)
Ammonia gas
45
What is a Bronsted-Lowry acid?
Answer
(B)
A proton donor
46
What type of substance is sodium hydroxide?
Answer
(B)
Base
47
Which of the following is a characteristic of an acidic solution?
Answer
(D)
Contains a high concentration of H+ ions
48
What happens to the hydrogen ion concentration as the pH of a solution increases?
Answer
(B)
Decreases
49
What is the term used to describe an oxide that can act as both an acid and a base?
Answer
(D)
Amphoteric oxide
50
Which of the following is a characteristic of a basic oxide?
Answer
(B)
Reacts with acids to form salt and water.