Acids Bases and Salts Practice Questions
NECO (Nigeria) · NECO Chemistry · 147 free MCQs with instant results and detailed explanations.
147
Total
42
Easy
78
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 paper red.
B.
They feel slippery to the touch.
C.
They taste bitter.
D.
They produce hydroxide ions in solution.
Show Answer & Explanation
Correct Answer: A
Acids are known to turn blue litmus paper red, which is a key characteristic that distinguishes them from bases.
Q2
Easy
What is the pH range of a neutral solution at 25°C?
A.
0 - 3
B.
3 - 7
C.
7
D.
7 - 14
Show Answer & Explanation
Correct Answer: C
A neutral solution has a pH of exactly 7, indicating neither acidic nor basic properties.
Q3
Easy
Which of the following substances is classified as a base?
A.
HCl
B.
NaOH
C.
CH3COOH
D.
NH4Cl
Show Answer & Explanation
Correct Answer: B
NaOH (sodium hydroxide) is a strong base that dissociates in water to produce hydroxide ions, making it a classic example of a base.
Q4
Medium
What is the pH of a solution that is neutral at 25°C?
A.
0
B.
7
C.
14
D.
1
Show Answer & Explanation
Correct Answer: B
A neutral solution at 25°C has a pH of 7, indicating that the concentration of hydrogen ions [H⁺] and hydroxide ions [OH⁻] are equal.
Q5
Medium
If 50 mL of 0.1 M hydrochloric acid (HCl) is neutralized by a sodium hydroxide (NaOH) solution, what is the volume of NaOH required if it's 0.1 M?
A.
50 mL
B.
100 mL
C.
25 mL
D.
75 mL
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Correct Answer: A
The reaction between HCl and NaOH is a 1:1 reaction, so 50 mL of 0.1 M HCl will require 50 mL of 0.1 M NaOH for complete neutralization.
Q6
Medium
Which of the following salts is formed from the reaction of a strong acid and a weak base?
A.
Sodium chloride (NaCl)
B.
Copper(II) sulfate (CuSO₄)
C.
Ammonium chloride (NH₄Cl)
D.
Calcium carbonate (CaCO₃)
Show Answer & Explanation
Correct Answer: C
Ammonium chloride (NH₄Cl) is formed from the combination of hydrochloric acid (strong acid) and ammonium hydroxide (weak base), resulting in a salt that can make the solution slightly acidic.
Q7
Medium
What is the characteristic of a basic solution?
A.
It turns litmus paper red.
B.
It has a sour taste.
C.
It feels slippery.
D.
It has a high concentration of hydrogen ions.
Show Answer & Explanation
Correct Answer: C
Basic solutions feel slippery due to the presence of hydroxide ions (OH⁻), which interact with the oils on skin and give a slippery sensation.
Q8
Hard
Which of the following acids can act as both a strong acid and a weak acid depending on the solvent used?
A.
Hydrochloric acid (HCl)
B.
Sulfuric acid (H2SO4)
C.
Carbonic acid (H2CO3)
D.
Acetic acid (CH3COOH)
Show Answer & Explanation
Correct Answer: C
Carbonic acid (H2CO3) can behave as a weak acid in water and can release protons (H+) depending on the pH of the solution, making it versatile in different solvent environments. Other acids listed are either strong or consistent in their acidic strength.
Q9
Hard
A solution of hydrochloric acid (HCl) has a pH of 1. What is the concentration of H+ ions in this solution?
A.
0.1 M
B.
0.01 M
C.
1.0 M
D.
0.001 M
Show Answer & Explanation
Correct Answer: A
The pH of a solution is defined as the negative logarithm of the hydrogen ion concentration. A pH of 1 means the concentration of H+ ions is 10^(-1), which equals 0.1 M.
Q10
Hard
Which of the following salts is formed by the neutralization of sulfuric acid (H2SO4) with sodium hydroxide (NaOH)?
A.
Sodium sulfate
B.
Sodium bisulfate
C.
Sodium sulfide
D.
Sodium hydrosulfide
Show Answer & Explanation
Correct Answer: A
When sulfuric acid (H2SO4) reacts with sodium hydroxide (NaOH), the resulting salt is sodium sulfate (Na2SO4). This occurs because the complete neutralization produces two sodium ions for every sulfate ion. Other options represent different chemical compounds not formed in this reaction.
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Acids Bases and Salts — NECO (Nigeria) NECO Chemistry Practice Questions Online
This page contains 147 practice MCQs for the chapter Acids Bases and Salts in NECO (Nigeria) NECO Chemistry. The questions are organized by difficulty — 42 easy, 78 medium, 27 hard — so you can choose the right level for your preparation.
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