Acids, Bases, and Salts Quiz
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Questions and Answers

What is the correct observation when red litmus paper is dipped into a 20% sodium hydroxide solution?

  • Red litmus paper turns blue (correct)
  • Red litmus paper turns red
  • Red litmus paper remains unchanged
  • Red litmus paper turns green

    • When a student adds 2 ml of water to 2 ml of acetic acid in a test tube, what is the likely observation?

  • The solution becomes light orange
  • Acetic acid floats over the surface of water
  • Water floats over the surface of acetic acid
  • The acetic acid dissolves readily in water (correct)

    • After adding 4 ml of acetic acid to 4 ml of distilled water in a test tube, what does the student observe after leaving it to settle for about 10 minutes?

  • A clear colorless solution (correct)
  • A layer of water over the layer of acetic acid
  • A layer of acetic acid over the layer of water
  • A precipitate settling at the bottom of the test tube

    • How can a student test for the gas liberated when hydrochloric acid reacts with an active metal?

    <p>By observing the liberation of hydrogen gas</p> Signup and view all the answers

    Which pH value indicates a stronger acid, pH=5 or pH=2?

    <p>pH=2</p> Signup and view all the answers

    What is the solution that reacts with crushed egg shells to give a gas that turns lime milky?

    <p>HCl</p> Signup and view all the answers

    Why does tooth decay start when pH of mouth is lower than 5.5?

    <p>The acid produced by bacteria attacks the enamel at this pH level</p> Signup and view all the answers

    When fresh milk changes into curd, will its pH value increase or decrease? Why?

    <p>The pH value will decrease due to the formation of lactic acid.</p> Signup and view all the answers

    Why does the flow of acid rainwater into a river make the survival of aquatic life difficult?

    <p>Acid rainwater decreases the pH of the river water</p> Signup and view all the answers

    How does the flow of acid rain water into a river make the survival of aquatic life difficult?

    <p>It lowers the pH of the river water.</p> Signup and view all the answers

    Which observation is true about a dilute solution of acetic acid?

    <p>It has a low pH value.</p> Signup and view all the answers

    What happens to the pH value of an aqueous solution when an acid and a base are mixed together?

    <p>The pH value remains unchanged.</p> Signup and view all the answers

    Why does a solution react with crushed egg shells to produce a gas that turns lime milky?

    <p>Due to the presence of hydrochloric acid (HCl).</p> Signup and view all the answers

    What gas is produced when a solution reacts with crushed eggshells to turn lime milky?

    <p>HCl</p> Signup and view all the answers

    What happens to the pH value when fresh milk changes into curd (yogurt)?

    <p>Decreases due to the formation of lactic acid</p> Signup and view all the answers

    Why does the flow of acid rain water into a river make the survival of aquatic life difficult?

    <p>It lowers the pH of the river water</p> Signup and view all the answers

    Which observation is true about a dilute solution of acetic acid?

    <p>Turns blue litmus paper red</p> Signup and view all the answers

    What is the likely observation when a student tests for the gas liberated when hydrochloric acid reacts with an active metal?

    <p>Formation of a colorless, odorless gas</p> Signup and view all the answers

    What is the correct observation when red litmus paper is dipped into a 20% sodium hydroxide solution?

    <p>Turns blue</p> Signup and view all the answers

    What can a student observe when red litmus paper is dipped into a 20% sodium hydroxide solution?

    <p>The red litmus paper turns blue</p> Signup and view all the answers

    What happens when a student adds 2 ml of water to 2 ml of acetic acid in a test tube?

    <p>The acetic acid dissolves readily in water</p> Signup and view all the answers

    After adding 4 ml of acetic acid to 4 ml of distilled water in a test tube, what does the student observe after leaving it to settle for about 10 minutes?

    <p>A clear colorless solution</p> Signup and view all the answers

    How can a student test for the gas liberated when hydrochloric acid reacts with an active metal?

    <p>By placing a lighted match stick near the gas to check for a pop sound</p> Signup and view all the answers

    Which observation is true about a dilute solution of acetic acid?

    <p>It smells like vinegar and turns red litmus blue</p> Signup and view all the answers

    Why does tooth decay start when pH of mouth is lower than 5.5?

    <p>Acid produced in the mouth attacks the enamel</p> Signup and view all the answers

    Why does flow of acid rain water into a river make the survival of aquatic life difficult?

    <p>Decreases the concentration of dissolved oxygen in the river water</p> Signup and view all the answers

    What is the correct observation when red litmus paper is dipped into a 20% sodium hydroxide solution?

    <p>(I), (II) and (IV)</p> Signup and view all the answers

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