Atoms and Molecules Model Question Paper

10th Standard

    Reg.No. :
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Science

Time : 01:00:00 Hrs
Total Marks : 50
    5 x 1 = 5
  1. An atom of an element has 13 electrons and mass number 27. The nucleus of this atom contains ____________ neutrons.

    (a)

    26

    (b)

    13

    (c)

    14

    (d)

    27

  2. The relative atomic masses of many elements are not whole number because

    (a)

    they are not determined accurately

    (b)

    they exist as isotopes

    (c)

    due to impurities

    (d)

    atoms ionize

  3. The atomicity of Chlorine is

    (a)

    1

    (b)

    4

    (c)

    8

    (d)

    2

  4. The total number of electrons present in 16 g of methane gas is

    (a)

    96.352 x 1023

    (b)

    48.176 x 1023

    (c)

    6.023 X 1023

    (d)

    30.11 x 1023

  5. What mass of hydrogen and oxygen will be produced on complete electrolysis of 18 g of water

    (a)

    2 g hydrogen and 32 g oxygen

    (b)

    2 g hydrogen and 16 g oxygen

    (c)

    4 g hydrogen and 32 g oxygen

    (d)

    4 g hydrogen and 14 g oxygen

  6. 4 x 2 = 8
  7. What is a hetero atomic molecule? Give two examples

  8. Give an example of homo triatomic molecule

  9. State Avogadro's Hypothesis.

  10. List any two differences between atom and molecules.

  11. 4 x 4 = 16
  12. Give the salient features of “Modern atomic theory”.

  13. Derive the relationship between Relative molecular mass and Vapour density.

  14. Give the applications of Avogadro's hypothesis.

  15. How will you determine the atomicity of gases using Avogadro's hypothesis?

  16. 3 x 7 = 21
  17. Find the gram molecular mass of carbon dioxide (CO2)

  18. Calculate the number of moles in 81g of aluminum.

  19. Calculate the number of molecules in 11g of CO2

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