Acids Bases and Salts Practice Questions
HSC/SSC (Bangladesh) · HSC Chemistry · 140 free MCQs with instant results and detailed explanations.
140
Total
37
Easy
76
Medium
27
Hard
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Sample Questions from Acids Bases and Salts
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Q1
Easy
Which of the following is a characteristic property of acids?
A.
They turn blue litmus red.
B.
They produce hydroxide ions in solution.
C.
They taste bitter.
D.
They are slippery to touch.
Show Answer & Explanation
Correct Answer: A
Acids are known for turning blue litmus paper red, which is a classic characteristic that distinguishes them from bases.
Q2
Easy
What is the pH range of a neutral solution at 25°C?
A.
0-7
B.
7
C.
7-14
D.
14
Show Answer & Explanation
Correct Answer: B
At 25°C, a neutral solution has a pH of exactly 7, indicating neither acidic nor basic properties.
Q3
Easy
Which of the following substances is a strong acid?
A.
Acetic acid
B.
Hydrochloric acid
C.
Carbonic acid
D.
Citric acid
Show Answer & Explanation
Correct Answer: B
Hydrochloric acid (HCl) is classified as a strong acid because it completely dissociates in water, unlike the others listed.
Q4
Medium
What is the pH of a solution if the concentration of hydrogen ions [H⁺] is 1 × 10⁻⁷ mol/L?
A.
7
B.
14
C.
0
D.
3
Show Answer & Explanation
Correct Answer: A
The pH is calculated using the formula pH = -log[H⁺]. For [H⁺] = 1 × 10⁻⁷, pH = -log(1 × 10⁻⁷) = 7, indicating a neutral solution.
Q5
Medium
Which of the following statements regarding strong acids is correct?
A.
They completely ionize in solution.
B.
They partially ionize in solution.
C.
They do not conduct electricity.
D.
They have high pH values.
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Correct Answer: A
Strong acids fully dissociate into their ions in aqueous solutions, allowing them to produce a high concentration of H⁺ ions, which is why they are classified as strong acids.
Q6
Medium
What is the result when you mix equal volumes of 0.1 M hydrochloric acid (HCl) and 0.1 M sodium hydroxide (NaOH)?
A.
A solution with a pH of 7
B.
A solution with a pH less than 7
C.
A solution with a pH greater than 7
D.
A colorless solution
Show Answer & Explanation
Correct Answer: A
When equal volumes of strong acid (HCl) and strong base (NaOH) react, they neutralize each other, leading to the formation of water and a salt, resulting in a neutral solution with a pH of 7.
Q7
Medium
Which of the following salts is formed when hydrochloric acid reacts with sodium carbonate?
A.
Sodium chloride
B.
Sodium bicarbonate
C.
Sodium sulfate
D.
Sodium phosphate
Show Answer & Explanation
Correct Answer: A
The reaction between hydrochloric acid (HCl) and sodium carbonate (Na₂CO₃) produces sodium chloride (NaCl), water, and carbon dioxide, confirming that sodium chloride is the correct salt formed.
Q8
Hard
Which of the following statements about strong acids and weak acids is INCORRECT?
A.
Strong acids fully dissociate in water.
B.
Weak acids only partially dissociate in water.
C.
Strong acids have higher pH values than weak acids.
D.
The degree of dissociation is 100% for strong acids.
Show Answer & Explanation
Correct Answer: C
Strong acids have lower pH values than weak acids due to their complete dissociation, meaning they produce more H+ ions in solution.
Q9
Hard
If 0.1 M hydrochloric acid (HCl) is mixed with 0.1 M sodium hydroxide (NaOH), what is the resulting pH of the solution?
A.
7
B.
0
C.
14
D.
3
Show Answer & Explanation
Correct Answer: A
The mixing of equal concentrations of a strong acid (HCl) and a strong base (NaOH) results in a neutralization reaction producing water and salt, leading to a neutral pH of 7.
Q10
Hard
Which of the following salts will produce a neutral solution when dissolved in water?
A.
Sodium chloride (NaCl)
B.
Ammonium sulfate ((NH4)2SO4)
C.
Potassium nitrate (KNO3)
D.
Calcium sulfate (CaSO4)
Show Answer & Explanation
Correct Answer: A
Sodium chloride (NaCl) is the salt formed from a strong acid (HCl) and a strong base (NaOH). It dissociates in water without affecting the pH of the solution, resulting in a neutral pH. The other salts either contain ammonium (which makes the solution acidic) or have ions that can influence the pH.
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Acids Bases and Salts — HSC/SSC (Bangladesh) HSC Chemistry Practice Questions Online
This page contains 140 practice MCQs for the chapter Acids Bases and Salts in HSC/SSC (Bangladesh) HSC Chemistry. The questions are organized by difficulty — 37 easy, 76 medium, 27 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit.