CBSE  /  Class 9  /  Science  /  Atoms and Molecules

  • 1. 
    Percentage of calcium in calcium carbonate is

  • 40
  • 30
  • 48
  • 36

  • 2. 
    Which has maximum number of molecules?

  • 1 g of CO
  • 1 g of N
  • 1 g of H

  • 3. 
    What mass of carbon dioxide (CO2) will contain 3.011 × 1023 molecules?

  • 11. 0 g
  • 22. 0 g
  • 4. 4 g
  • 44. 0 g

  • 4. 
    The value of Avogadro’s constant is:

  • 6. 0 × 10
  • 6. 01 × 10
  • 6. 022 × 10
  • 6. 022 × 10

  • 5. 
    How many times an atom of sulphur is heavier than an atom of carbon?

  • 32 times
  • 12 times
  • 8/3 times
  • 12/32 times

  • 6. 
    Which of the following represents 12 u?

  • Mass of 1 hydrogen atom
  • Mass of C-12 atom
  • Mass of 0-16 atom
  • 1/12th of mass of C-12 atom.

  • 7. 
    Which of the following would weigh the highest?

  • 0. 2 mole of sucrose
  • 2 moles of CO
  • 2 moles of CaCO
  • 10 moles of H

  • 8. 
    The molecule having an atomicity of 4 is:

  • Sulphate molecule
  • Ozone molecule
  • Phosphorus molecule
  • Methane molecule
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