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Acid-Base Basics: 26 MCQs with answers

All 26 multiple-choice questions from this kit, free and with no sign-up.

Full kit · everything

Warm-up · 18 questions

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

Beginner
A They feel slippery to touch B They have a bitter taste C They turn blue litmus red D They turn red litmus blue
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They turn blue litmus red

Acids turn blue litmus paper red, while bases turn red litmus blue.

Q2. What is the pH range of acidic solutions?

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

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

Q3. What is formed when an acid reacts with a base?

Beginner
A Salt and water B Water and carbon dioxide C Salt and oxygen gas 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.

Q4. Which of the following is a base?

Beginner
A Lemon juice B Curd C Vinegar D Soap
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Soap

Soap is basic in nature, while vinegar, lemon juice, and curd are acidic.

Q5. What is the pH of a neutral solution?

Beginner
A 0 B 7 C 14 D 1
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7

A neutral solution, such as pure water, has a pH of 7.

Q6. Which of the following is a natural indicator?

Beginner
A Phenolphthalein B Litmus C Methyl orange D Universal indicator
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Litmus

Litmus is a natural indicator extracted from lichens. The others are synthetic indicators.

Q7. What is the pH range of basic solutions?

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

Basic solutions have a pH greater than 7, up to 14.

Q8. Acids taste sour and bases taste bitter.

Beginner
A True B False
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True

Acids are sour in taste, while bases are bitter and feel slippery.

Q9. What is the chemical formula for hydrochloric acid?

Beginner
A CH3COOH B H2SO4 C HCl D NaOH
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HCl

Hydrochloric acid is represented by the chemical formula HCl.

Q10. Which of the following is a characteristic of bases?

Beginner
A They feel slippery B They turn blue litmus red C They produce hydrogen ions in solution D They taste sour
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They feel slippery

Bases typically feel slippery to the touch.

Q11. What is the pH of a strong acid solution?

Beginner
A Below 7 B Exactly 7 C Neutral D Above 7
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Below 7

Strong acids have a pH that is below 7.

Q12. Which ion is responsible for the basic properties of a solution?

Beginner
A OH- B Na+ C Cl- D H+
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OH-

The hydroxide ion (OH-) is responsible for the basic properties of a solution.

Q13. What is formed when an acid reacts with a base?

Beginner
A Metal and salt B Acid and base C Gas and water D Salt and water
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Salt and water

The reaction between an acid and a base produces salt and water.

Q14. What is the chemical formula for sodium hydroxide?

Beginner
A H2O B NaCl C KOH D NaOH
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NaOH

Sodium hydroxide is represented by the chemical formula NaOH.

Q15. Which of the following is a property of acids?

Beginner
A They turn litmus paper blue B They feel slippery C They taste sour D They produce hydroxide ions in solution
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They taste sour

Acids are known for their sour taste.

Q16. Which of the following is a common use of sulfuric acid?

Beginner
A Household cleaning B Batteries C Cooking D Food preservation
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Batteries

Sulfuric acid is commonly used in batteries.

Q17. What is the effect of adding an acid to water?

Beginner
A It turns the water blue B It decreases the temperature C It increases the temperature D It neutralizes the water
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It increases the temperature

Adding an acid to water typically increases the temperature due to the exothermic reaction.

Q18. Which of the following substances is a common household acid?

Beginner
A Soap B Baking soda C Bleach D Vinegar
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Vinegar

Vinegar contains acetic acid and is a common household acid.

Building up · 8 questions

Q19. Which ion is responsible for the acidic properties of a solution?

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

Acids produce hydrogen ions (H⁺) in aqueous solution, which are responsible for their acidic properties.

Q20. Which of the following is a strong acid?

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

Hydrochloric acid (HCl) is a strong acid because it completely ionizes in water, while the others are weak acids.

Q21. Which gas is produced when a metal reacts with a dilute acid?

Intermediate
A Hydrogen B Carbon dioxide C Nitrogen D Oxygen
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Hydrogen

Metals react with dilute acids to produce hydrogen gas, which burns with a pop sound.

Q22. Which of the following is a weak base?

Intermediate
A Ammonium hydroxide B Potassium hydroxide C Sodium hydroxide D Calcium hydroxide
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Ammonium hydroxide

Ammonium hydroxide (NH₄OH) is a weak base because it does not completely ionize in water, unlike the other strong bases listed.

Q23. What is the effect of adding water to an acid?

Intermediate
A The acid becomes more concentrated B The pH increases C The pH decreases D The pH remains the same
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The pH increases

Diluting an acid with water increases the pH, making it less acidic (closer to 7).

Q24. What is the product of the reaction between an acid and a metal carbonate?

Intermediate
A Salt, water, and carbon dioxide B Salt and water only C Salt and hydrogen D Salt and oxygen
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Salt, water, and carbon dioxide

Acids react with metal carbonates to produce salt, water, and carbon dioxide gas.

Q25. Which of the following is a strong base?

Intermediate
A Ammonium hydroxide B Ferric hydroxide C Sodium hydroxide D Aluminium hydroxide
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Sodium hydroxide

Sodium hydroxide (NaOH) is a strong base because it completely dissociates into ions in water.

Q26. All bases are soluble in water.

Intermediate
A True B False
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False

Only bases that are soluble in water are called alkalis. Many bases, such as copper oxide, are insoluble in water.

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