CBSE  /  Class 9  /  Science  /  Atoms and Molecules

  • 1. 
    The chemical symbol for nitrogen gas is

  • Ni
  • N
  • N
  • N

  • 2. 
    The chemical symbol for sodium is

  • So
  • Sd
  • NA
  • Na

  • 3. 
    Which of the following would weigh the highest?

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

  • 4. 
    Which of the following has maximum number of atoms?

  • 18 g of H
  • 18 g of O
  • 18 g of CO
  • 18 g of CO

  • 5. 
    Which of the following correctly represents 360 g of water?

  • (i)
  • (i) and (iv)
  • (ii) and (iii)
  • (ii) and (iv)

  • 6. 
    3. 42 g of sucrose are dissolved in 18 g of water in a beaker. The number of oxygen atoms in the solution are

  • 6. 68 × 10
  • 6. 09 × 10
  • 6. 022 × 10
  • 6. 022 × 10

  • 7. 
    A change in the physical state can be brought about

  • only when energy is given to the system
  • only when energy is taken out from the system
  • when energy is either given to, or taken out from the system
  • without any energy change

  • 8. 
    The relative molecular mass of Na2S2O3.5H2O is

  • 250 amu
  • 250 g
  • 248 amu
  • 248 g

  • 9. 
    5H

  • 250 amu
  • 250 g
  • 248 amu
  • 248 g

  • 10. 
    Which of the following has maximum number of atom?

  • 18 g H
  • 18 g of O
  • 18 g of CO
  • 18 g of CH
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