Essential Chemistry for IGCSE - Acids And Bases (Section 5)
1
What gas is often produced when an acid reacts with a metal?
Answer
(B)
Hydrogen
2
What is the pH range that indicates acidic conditions?
Answer
(B)
0-6.9
3
What do acids and bases have in common in terms of the ionic equation?
Answer
(D)
They both contribute to the formation of water
4
Which of the following is NOT a strong acid?
Answer
(D)
Acetic acid
5
What is the common name of the acid found in vinegar?
Answer
(B)
Acetic Acid
6
What color does litmus paper turn in an acidic solution?
Answer
(B)
Red
7
What is the common name of the acid present in lemons?
Answer
(B)
Citric acid
8
In the reaction of magnesium with hydrochloric acid, what is the role of hydrochloric acid?
Answer
(C)
Acid
9
What color does universal indicator turn in an acidic solution?
Answer
(A)
Red
10
Which of the following statements is/are true about neutralization reactions?
Answer
A
B
11
What type of substance will turn red litmus paper blue?
Answer
(B)
Base
12
What ion is responsible for the acidic properties of a solution?
Answer
(B)
Hydronium (H3O+)
13
What is the name of the process of determining the unknown concentration of an acid or base through reaction with a known concentration of acid or base, where an indicator signals the endpoint?
Answer
(A)
Titration
14
What ion is present in excess in a solution with a pH greater than 7?
Answer
(B)
OH-
15
Which gas is produced when an acid reacts with a metal carbonate?
Answer
(C)
Carbon Dioxide
16
What would be the pH if a solution turns both blue and red litmus paper red?
Answer
(D)
Impossible
17
Which of the following is a characteristic of acidic oxides?
Answer
(A)
React with bases to form salt and water.
18
What color does blue litmus paper turn in an acidic solution?
Answer
(B)
Red
19
What is the name given to the reaction between an acid and a base?
Answer
(C)
Neutralization
20
What is the color of a universal indicator in a solution with a pH of 2?
Answer
(C)
Red
21
What is the purpose of the litmus paper test?
Answer
(B)
To determine if a solution is acidic or basic
22
Which of the following is a common property of both acids and bases?
Answer
(B)
Conduct electricity
23
What is produced when an acid and a base react?
Answer
(A)
Salt and water
24
Which of the following is formed when an acid reacts with a base?
Answer
(C)
Water and salt
25
If a solution has a pH of 7, it is considered:
Answer
(C)
Neutral
26
What is the key characteristic of an amphoteric oxide?
Answer
(C)
Reacts with both acids and bases.
27
What is the name of the process where an acid is neutralized by a base?
Answer
(C)
Neutralization
28
What color will a universal indicator turn in a strong base?
Answer
(C)
Blue
29
What is the name of the indicator that turns yellow in basic solutions?
Answer
(C)
Methyl orange
30
What is the color of phenolphthalein in an acidic solution?
Answer
(D)
Colorless
31
What is the purpose of the universal indicator in acid-base tests?
Answer
(B)
To determine the pH of the solution.
32
What color does phenolphthalein indicator turn in an alkaline solution?
Answer
(A)
Red/Pink
33
Which of the following is an example of a basic oxide?
Answer
(C)
Na2O
34
Which of the following would indicate a strongly alkaline solution?
Answer
(C)
pH 9
35
What can be determined by using universal indicator?
Answer
(B)
pH
36
What does the reaction of an acid with a metal often produce?
Answer
(B)
Hydrogen and a salt
37
Which of the following statements is true regarding strong acids?
Answer
(A)
They are completely ionized in water.
38
What is the pH value of a neutral substance?
Answer
(B)
7
39
Which substance is a good conductor of electricity?
