Acids and Bases Practice Questions
SPM (Malaysia) · SPM Chemistry · 144 free MCQs with instant results and detailed explanations.
144
Total
35
Easy
79
Medium
30
Hard
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Sample Questions from Acids and Bases
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Q1
Easy
Which of the following is a strong base?
A.
Sodium hydroxide
B.
Acetic acid
C.
Ammonium hydroxide
D.
Carbonic acid
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Correct Answer: A
Sodium hydroxide (NaOH) is a strong base that completely dissociates in water, making it a strong alkaline solution.
Q2
Easy
Acids are known to turn litmus paper red. What property of acids causes this change?
A.
Release of hydroxide ions
B.
Release of hydrogen ions
C.
Absorption of water
D.
Production of carbon dioxide
Show Answer & Explanation
Correct Answer: B
Acids release hydrogen ions (H+) in solution, which is responsible for the change in color of litmus paper to red.
Q3
Easy
Which of the following is a characteristic of acids?
A.
They taste bitter.
B.
They turn litmus paper red.
C.
They feel slippery to touch.
D.
They release hydroxide ions in solution.
Show Answer & Explanation
Correct Answer: B
Acids are known to turn blue litmus paper red, indicating their acidic nature. This is a key characteristic of acids.
Q4
Medium
Which of the following compounds is a strong acid?
A.
Acetic acid
B.
Sodium bicarbonate
C.
Hydrochloric acid
D.
Citric acid
Show Answer & Explanation
Correct Answer: C
Hydrochloric acid (HCl) is considered a strong acid because it completely dissociates in water, releasing H+ ions, while the others are weak acids.
Q5
Medium
An unknown solution has a pH of 3. What type of solution is this?
A.
Neutral
B.
Basic
C.
Weak acid
D.
Strong acid
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Correct Answer: D
A solution with a pH of 3 is acidic, and since it is closer to 0 than 7, it is classified as a strong acid due to its higher concentration of H+ ions.
Q6
Medium
Which indicator would be best to determine the endpoint of a titration involving a strong acid and a strong base?
A.
Methyl orange
B.
Bromothymol blue
C.
Litmus
D.
Phenolphthalein
Show Answer & Explanation
Correct Answer: B
Bromothymol blue is suitable for strong acid-strong base titrations as it changes color around pH 7, indicating a neutral endpoint.
Q7
Medium
What is the conjugate base of sulfuric acid (H2SO4)?
A.
HSO4-
B.
H2SO4
C.
SO4^2-
D.
H3O+
Show Answer & Explanation
Correct Answer: A
When sulfuric acid donates a proton (H+), it becomes its conjugate base, hydrogen sulfate (HSO4-).
Q8
Hard
Which of the following statements correctly describes a characteristic of strong acids compared to weak acids?
A.
Strong acids completely dissociate in water, while weak acids do not.
B.
Strong acids have a higher pH than weak acids.
C.
Strong acids react less vigorously with metals than weak acids.
D.
Strong acids are less corrosive than weak acids.
Show Answer & Explanation
Correct Answer: A
Strong acids, such as hydrochloric acid, completely dissociate into ions in water, leading to a greater concentration of hydrogen ions, while weak acids only partially dissociate. This characteristic is fundamental in differentiating between strong and weak acids.
Q9
Hard
A 0.1 M solution of hydrochloric acid (HCl) and a 0.1 M solution of acetic acid (CH3COOH) are prepared. Which solution has a higher conductivity and why?
A.
HCl, because it completely dissociates into ions.
B.
CH3COOH, because it has a higher molecular weight.
C.
Both have the same conductivity due to equal molarity.
D.
Neither, both are insulators.
Show Answer & Explanation
Correct Answer: A
HCl is a strong acid that completely dissociates in solution, producing more ions compared to acetic acid, which is a weak acid and only partially dissociates. Therefore, the conductivity of the HCl solution is higher due to the greater number of charge carriers.
Q10
Hard
What is the pH of a solution that has a hydrogen ion concentration of 1.0 x 10^-5 mol/L?
A.
5
B.
7
C.
9
D.
10
Show Answer & Explanation
Correct Answer: A
The pH of a solution is calculated using the formula pH = -log[H+]. Here, [H+] = 1.0 x 10^-5 mol/L, so pH = -log(1.0 x 10^-5) = 5. This indicates a slightly acidic solution.
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Acids and Bases — SPM (Malaysia) SPM Chemistry Practice Questions Online
This page contains 144 practice MCQs for the chapter Acids and Bases in SPM (Malaysia) SPM Chemistry. The questions are organized by difficulty — 35 easy, 79 medium, 30 hard — so you can choose the right level for your preparation.
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