Atoms and Molecules Book Back Questions

10th Standard EM

    Reg.No. :
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Science

Time : 00:45:00 Hrs
Total Marks : 30
    4 x 1 = 4
  1. Th e volume occupied by 4.4 g of CO2 at S.T.P

    (a)

    22.4 litre

    (b)

    2.24 litre

    (c)

    0.24 litre

    (d)

    0.1 litre

  2. The volume occupied by 1 mole of a diatomic gas at S.T.P is

    (a)

    11.2 litre

    (b)

    5.6 litre

    (c)

    22.4 litre

    (d)

    44.8 litre

  3. The gram molecular mass of oxygen molecule is

    (a)

    16 g

    (b)

    18 g

    (c)

    32 g

    (d)

    17 g

  4. 1 mole of any substance contains __________ molecules

    (a)

    6.023 × 1023

    (b)

    6.023 × 1023

    (c)

    3.0115 × 1023

    (d)

    12.046 × 1023

  5. 5 x 1 = 5
  6. The sum of the numbers of protons and neutrons of an atom is called its __________

    ()

    mass number

  7. The average atomic mass of hydrogen is ___________ amu.

    ()

    1.0079

  8. The number of atoms present in a molecule is called its ____________

    ()

    atomicity

  9. One mole of any gas occupies ________ ml at S.T.P

    ()

    22400

  10. Atomicity of phosphorous is ___________

    ()

    4

  11. 3 x 2 = 6
  12. Define : Relative atomic mass.

  13. Define : Atomicity

  14. Find the percentage of nitrogen in ammonia.

  15. 2 x 4 = 8
  16. Calculate the number of water molecule present in one drop of water which weighs 0.18 g.

  17. Give the salient features of “Modern atomic theory”

  18. 1 x 7 = 7
  19. Calculation of molar mass
    Calculate the gram molar mass of the following.
    1) H2O
    2) CO2
    3) Ca3 (PO4)2

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