Properties of Acids and Bases Quiz - CBSE Class 9 Science

Free practice quiz: Properties of Acids and Bases (CBSE Class 9 Science). 20 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

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

   1. They turn blue litmus red
   2. They taste bitter
   3. They feel slippery
   4. They are good conductors of electricity
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   Answer: A. They turn blue litmus red

   A common property of acids is that they turn blue litmus paper red.

2. What color does phenolphthalein turn in a basic solution?

   1. Pink
   2. Colorless
   3. Blue
   4. Red
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   Answer: A. Pink

   Phenolphthalein is a chemical indicator that turns pink in basic solutions.

3. What is a common use for sodium hydroxide?

   1. Glass making
   2. Paper production
   3. Preservative
   4. Food seasoning
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   Answer: B. Paper production

   Sodium hydroxide, commonly known as lye, is used in the paper industry for processing wood into pulp.

4. Which base is used in the manufacture of soap?

   1. Sodium hydroxide
   2. Ammonium hydroxide
   3. Calcium hydroxide
   4. Lithium hydroxide
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   Answer: A. Sodium hydroxide

   Sodium hydroxide is used traditionally in soap making as it reacts with fats in a process called saponification.

5. What is the term for a substance that can act as both an acid and a base?

   1. Amphoterism
   2. Isomerism
   3. Catalysis
   4. Decomposition
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   Answer: A. Amphoterism

   Amphoterism refers to the ability of a substance to act as both an acid and a base.

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