Class VIII Chemistry: Chemical Effects of Electric Current
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Questions and Answers

What is the process of decomposition of an electrolyte using electricity called?

  • Electroplating
  • Chemical Effects
  • Electrolysis (correct)
  • Conduction of Electricity

    • Which material is commonly used to make electrodes for electrolysis?

  • Gold
  • Aluminum
  • Platinum (correct)
  • Steel

    • What type of changes occur at the electrodes during electrolysis?

  • Physical changes
  • Temperature changes
  • No changes
  • Chemical changes (correct)

    • What is the purpose of electroplating?

    <p>To enhance appearance</p> Signup and view all the answers

    In the electrolysis of water, what gas is liberated at the cathode?

    <p>Hydrogen gas</p> Signup and view all the answers

    What happens when an electric current passes through an electrolyte?

    <p>Chemical changes occur</p> Signup and view all the answers

    Which factor does not affect the amount of substance deposited during electrolysis?

    <p>Temperature of the electrolyte</p> Signup and view all the answers

    Which type of material is best suited for making electrodes in electrolysis?

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

    What causes the sound known as thunder during a lightning discharge?

    <p>Intense heating and rapid cooling of the air around the lightning bolt</p> Signup and view all the answers

    Which natural phenomenon is characterized by the shaking of the ground?

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

    What is the key safety measure advised during a lightning storm?

    <p>Taking cover indoors</p> Signup and view all the answers

    What is Benjamin Franklin's notable contribution related to lightning?

    <p>Understanding of lightning and invention of lightning rod</p> Signup and view all the answers

    How is static electricity generated on objects?

    <p>Through the accumulation of electric charge on their surfaces from electron transfer</p> Signup and view all the answers

    What is the purpose of discussing safety precautions during thunderstorms and earthquakes?

    <p>To ensure safety and preparedness during natural disasters</p> Signup and view all the answers

    How are conductors and insulators relevant to lightning safety and electrical circuits?

    <p>Conductors allow electricity to flow easily, which can be dangerous during lightning strikes</p> Signup and view all the answers

    Why is it important to unplug electronic devices during storms?

    <p>To prevent electrical hazards and damage due to power surges</p> Signup and view all the answers

    How does rubbing a balloon against hair demonstrate static electricity?

    <p>By creating a build-up of charges on the balloon and hair</p> Signup and view all the answers

    In terms of electricity flow, what differentiates conductors from insulators?

    <p>Insulators restrict the movement of electricity, while conductors facilitate it</p> Signup and view all the answers

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