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Acids & Bases: 15 MCQs with answers

All 15 multiple-choice questions from this kit, free and with no sign-up.

Full kit · everything

Warm-up · 8 questions

Q1. Which of the following is a characteristic property of acids?

Beginner
A They react with metals to produce hydrogen gas. B They feel slippery. C They turn blue litmus red. D They taste bitter.
Show answer & explanation

They turn blue litmus red.

Acids turn blue litmus paper red, which is a common test for acidity. Bitter taste and slippery feel are properties of bases, and while acids do react with metals to produce hydrogen gas, that is not the most characteristic simple property listed here.

Q2. Which of the following is a property of bases?

Beginner
A They have a pH less than 7. B They taste sour. C They turn red litmus blue. D They react with carbonates to produce carbon dioxide.
Show answer & explanation

They turn red litmus blue.

Bases turn red litmus paper blue. Sour taste is characteristic of acids, reaction with carbonates to produce carbon dioxide is a property of acids, and pH less than 7 indicates acidity.

Q3. What is the pH range of acidic solutions?

Beginner
A Exactly 7 B Below 7 C 7 to 14 D 0 to 7
Show answer & explanation

Below 7

Acidic solutions have a pH less than 7. A pH of exactly 7 is neutral, and pH greater than 7 indicates basicity.

Q4. What is the pH of a neutral solution?

Beginner
A 1 B 0 C 14 D 7
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7

A neutral solution has a pH of exactly 7 at 25°C. Pure water is neutral.

Q5. Which of the following is an example of a natural acid?

Beginner
A Soap B Lemon juice C Baking soda D Ammonia
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Lemon juice

Lemon juice contains citric acid, a natural acid. Soap, baking soda, and ammonia are basic.

Q6. What is the pH range of basic solutions?

Beginner
A Exactly 7 B 7 to 14 C Greater than 7 D 0 to 7
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Greater than 7

Basic solutions have a pH greater than 7. A pH of 7 is neutral, and less than 7 is acidic.

Q7. Acids turn red litmus paper blue.

Beginner
A True B False
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False

Acids turn blue litmus paper red. Bases turn red litmus paper blue.

Q8. A pH of 7 indicates a neutral solution.

Beginner
A True B False
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True

A pH of 7 is neutral, meaning the solution is neither acidic nor basic.

Building up · 7 questions

Q9. Which ion is responsible for the acidic properties of a solution?

Intermediate
A Chloride ion (Cl⁻) B Hydrogen ion (H⁺) C Hydroxide ion (OH⁻) D Sodium ion (Na⁺)
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Hydrogen ion (H⁺)

Acids release hydrogen ions (H⁺) in solution, which are responsible for their acidic properties. Hydroxide ions are responsible for basic properties.

Q10. What is produced when an acid reacts with a base?

Intermediate
A Salt and water B Only salt C Carbon dioxide and water D Salt and hydrogen gas
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Salt and water

The reaction between an acid and a base is called neutralization, which produces salt and water.

Q11. Which of the following is a strong acid?

Intermediate
A Hydrochloric acid B Citric acid C Carbonic acid D Acetic acid
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Hydrochloric acid

Hydrochloric acid (HCl) is a strong acid that completely ionizes in water. Acetic acid, citric acid, and carbonic acid are weak acids.

Q12. Which of the following is a weak base?

Intermediate
A Sodium hydroxide (NaOH) B Potassium hydroxide (KOH) C Ammonium hydroxide (NH₄OH) D Calcium hydroxide (Ca(OH)₂)
Show answer & explanation

Ammonium hydroxide (NH₄OH)

Ammonium hydroxide is a weak base because it does not completely ionize in water. Sodium hydroxide, potassium hydroxide, and calcium hydroxide are strong bases.

Q13. Which gas is produced when an acid reacts with a metal?

Intermediate
A Hydrogen B Carbon dioxide C Oxygen D Nitrogen
Show answer & explanation

Hydrogen

Acids react with metals to produce hydrogen gas. For example, zinc reacts with hydrochloric acid to produce hydrogen gas.

Q14. What is the reaction between an acid and a base called?

Intermediate
A Reduction B Neutralization C Oxidation D Combustion
Show answer & explanation

Neutralization

The reaction between an acid and a base to form salt and water is called neutralization.

Q15. Which of the following is a strong base?

Intermediate
A Sodium hydroxide B Ammonia C Iron(III) hydroxide D Aluminium hydroxide
Show answer & explanation

Sodium hydroxide

Sodium hydroxide (NaOH) is a strong base that completely dissociates in water. Ammonia, aluminium hydroxide, and iron(III) hydroxide are weak bases.

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