Quiz  /  Acids and Bases Class 9 MCQ Questions With Answers

  • 1. 
    Explain what happens when a strong acid and a strong base are poured into the same container.

  • they form separate layers
  • they mix physically but not chemically
  • they break apart into separate elements
  • they react chemically to form a salt

  • 2. 
    Which of these pH values would indicate that a solution is a weak base?

  • 4
  • 5.6
  • 8
  • 13

  • 3. 
    Which of the following is true about acids and bases?

  • The lower the pH, the stronger the acid
  • the higher the pH, the stronger the acid
  • The lower the pH, the more neutral the acid
  • The higher the pH, the weaker the base

  • 4. 
    When dissolved in water, acids produce:

  • bases
  • salts
  • hydrogen ions
  • hydroxide ions

  • 5. 
    Which statement is true when acids and bases are mixed together?

  • acids become stronger
  • bases become stronger
  • there is no change
  • they neutralize each other

  • 6. 
    Which of these solutions is an acid?

  • Dish Soap: pH of 12
  • Tomato Soup: pH of 4
  • Baking Soda: pH of 9
  • Drain Cleaner: pH of 14

  • 7. 
    Ranging from 0 to 14, a pH value indicates how acidic or basic a solution is. Which of these pH values would be a strong acid?

  • 2
  • 6
  • 9
  • 13

  • 8. 
    Litmus paper can tell you if a solution is acidic, neutral or basic by changing color when placed in a solution. If you test a base with litmus paper, it will turn ____________.

  • purple
  • red
  • blue
  • pink

  • 9. 
    Any substance that produces hydroxide ions in water is known as _____________.

  • an acid
  • a hydrogen ion
  • a base
  • a neutral

  • 10. 
    What is the pH of a neutral substance?

  • 0
  • 5
  • 7
  • 10

  • 11. 
    What does a pH of 1 indicate about a liquid?

  • it is a very strong base
  • it is a weak base
  • it is a weak acid
  • it is a strong acid

  • 12. 
    Ammonia has a pH of 12. Ammonia is __________.

  • an acid
  • a base
  • an element
  • a metal

  • 13. 
    Soap is a weak base. What is true about the taste of bases?

  • they taste sour
  • they taste sweet
  • they taste bitter
  • they taste salty

  • 14. 
    Which type of ion does a base produce when it is dissolved in water?

  • oxide
  • oxygen
  • hydrogen
  • hydroxide

  • 15. 
    When dissolved in water, bases produce:

  • acids
  • salts
  • hydrogen ions
  • hydroxide ions

  • 16. 
    What is the pH of water?

  • 0
  • 4
  • 7
  • 14

  • 17. 
    Williams collected a rain sample and measured its pH to be 5.6. What does this mean?

  • the rain water is a weak base
  • the rain water is neutral
  • the rain water is a strong acid
  • the rain water is a weak acid

  • 18. 
    The pH of vinegar is 2.5. Vinegar is a _____________.

  • strong acid
  • strong base
  • weak base
  • weak acid

  • 19. 
    Compounds form when _______________.

  • atoms of one element bond together
  • atoms of two or more elements bond together
  • molecules of one element are mixed together
  • molecules of two or more elements are mixed together
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