Acids and Bases Practice Questions
Thanaweya Amma (Egypt) · Thanaweya Chemistry · 139 free MCQs with instant results and detailed explanations.
139
Total
35
Easy
76
Medium
28
Hard
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Sample Questions from Acids and Bases
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Q1
Easy
Which of the following substances is classified as a strong acid?
A.
Hydrochloric acid (HCl)
B.
Acetic acid (CH3COOH)
C.
Boric acid (H3BO3)
D.
Carbonic acid (H2CO3)
Show Answer & Explanation
Correct Answer: A
Hydrochloric acid (HCl) is considered a strong acid because it completely dissociates in water, releasing a high concentration of hydrogen ions (H+). The other acids listed are weak acids and do not fully dissociate.
Q2
Easy
What is the pH of a solution with a hydrogen ion concentration of 1 x 10^-3 M?
A.
3
B.
7
C.
10
D.
1
Show Answer & Explanation
Correct Answer: A
The pH of a solution is calculated using the formula pH = -log[H+]. For a hydrogen ion concentration of 1 x 10^-3 M, the pH is -log(1 x 10^-3) = 3.
Q3
Easy
Which of the following statements correctly describes a characteristic of bases?
A.
They taste sour.
B.
They turn litmus paper red.
C.
They feel slippery to the touch.
D.
They react with metals to produce hydrogen gas.
Show Answer & Explanation
Correct Answer: C
Bases are known for their slippery feel due to the saponification reaction they can cause with fats and oils, making them feel smooth. The other statements describe properties of acids.
Q4
Medium
Which of the following statements correctly describes a property of acids?
A.
Acids turn blue litmus paper red.
B.
Acids feel slippery to the touch.
C.
Acids have a bitter taste.
D.
Acids react with metals to produce hydroxides.
Show Answer & Explanation
Correct Answer: A
Acids are known to turn blue litmus paper red, indicating their acidic nature. This is a classic property used to identify acids.
Q5
Medium
What is the pH of a solution that has a hydrogen ion concentration of 1 × 10^-3 M?
A.
3
B.
7
C.
10
D.
1
Show Answer & Explanation
Correct Answer: A
The pH is calculated using the formula pH = -log[H⁺]. For a concentration of 1 × 10^-3 M, pH = -log(1 × 10^-3) = 3.
Q6
Medium
Which of the following mixtures will produce a neutral solution when combined?
A.
Hydrochloric acid and sodium hydroxide
B.
Acetic acid and sodium bicarbonate
C.
Sulfuric acid and potassium sulfate
D.
Nitric acid and magnesium oxide
Show Answer & Explanation
Correct Answer: A
Hydrochloric acid (HCl) and sodium hydroxide (NaOH) react to form water and sodium chloride, resulting in a neutral solution.
Q7
Medium
What is the conjugate acid of the base ammonia (NH₃)?
A.
Ammonium ion (NH₄⁺)
B.
Hydroxide ion (OH⁻)
C.
Nitrogen gas (N₂)
D.
Nitric acid (HNO₃)
Show Answer & Explanation
Correct Answer: A
The conjugate acid of ammonia (NH₃) is the ammonium ion (NH₄⁺), formed when NH₃ accepts a proton (H⁺).
Q8
Hard
Which of the following statements correctly describes the behavior of a strong acid in water compared to a weak acid?
A.
A strong acid completely dissociates in solution, whereas a weak acid only partially dissociates.
B.
A strong acid has a higher pH than a weak acid in the same concentration.
C.
A strong acid has a lower conductivity than a weak acid in equal concentrations.
D.
A strong acid does not ionize in water, while a weak acid does.
Show Answer & Explanation
Correct Answer: A
A strong acid completely dissociates in water, releasing all of its hydrogen ions, while a weak acid only partially dissociates, resulting in fewer hydrogen ions in solution.
Q9
Hard
A solution contains 0.1 M of hydrochloric acid (HCl) and 0.1 M of acetic acid (CH3COOH). What is the expected pH of this solution?
A.
1
B.
2
C.
3
D.
4
Show Answer & Explanation
Correct Answer: B
The strong acid HCl will completely ionize, contributing 0.1 M of H+ ions, resulting in a pH of 1. The weak acetic acid will contribute a much smaller amount of H+ due to partial dissociation, but the dominant contribution is from HCl.
Q10
Hard
Which of the following is the strongest acid at 25°C?
A.
HCl
B.
H2SO4
C.
CH3COOH
D.
H3PO4
Show Answer & Explanation
Correct Answer: B
H2SO4, sulfuric acid, is a diprotic acid and dissociates completely in its first ionization step, making it a stronger acid than HCl, acetic acid (CH3COOH), and phosphoric acid (H3PO4) under standard conditions.
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Acids and Bases — Thanaweya Amma (Egypt) Thanaweya Chemistry Practice Questions Online
This page contains 139 practice MCQs for the chapter Acids and Bases in Thanaweya Amma (Egypt) Thanaweya Chemistry. The questions are organized by difficulty — 35 easy, 76 medium, 28 hard — so you can choose the right level for your preparation.
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