Class 10 Science Chemical Reactions Quiz
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Questions and Answers

What is the effective water of crystallization for one CaSO4 unit according to the formula provided?

  • 0.5 molecules of water (correct)
  • 2 molecules of water
  • 1.5 molecules of water
  • 1 molecule of water

    • Why do ionic compounds not conduct electricity in the solid state?

  • Ions are strongly bound together (correct)
  • Ions are free to move
  • Ions do not exist in solid ionic compounds
  • Ions are too large to conduct electricity

    • What is X in the reaction 2Al + Fe2O3 → Al2O3 + 2Fe?

  • Iron
  • Zinc
  • Aluminum (correct)
  • Oxygen

    • What process involves heating the ore strongly in the absence or limited supply of air?

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

    Why can't zinc oxide be reduced by heating alone?

    <p>Zinc oxide is moderately reactive</p> Signup and view all the answers

    What metals make up the alloy solder?

    <p>Lead and Tin</p> Signup and view all the answers

    Why do covalent compounds have low melting and boiling points?

    <p>Weak intramolecular forces between molecules</p> Signup and view all the answers

    What does the purple color of KMnO4 decolourize into?

    <p>Ethanoic acid</p> Signup and view all the answers

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