Atomic Structure Model Question Paper

8th Standard EM

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Science

Time : 00:45:00 Hrs
Total Marks : 30
    4 x 1 = 4
  1. The same proportion of carbon and oxygen in the carbon dioxide obtained from different sources proves the law of __________

    (a)

    reciprocal proportion

    (b)

    definite proportion

    (c)

    multiple proportion

    (d)

    conservation of mass

  2. Cathode rays are made up of

    (a)

    neutral particles

    (b)

    positively charged particles

    (c)

    negatively charged particles

    (d)

    None of the above

  3. In water, hydrogen and oxygen are combined in the ratio of _______by mass.

    (a)

    1:8

    (b)

    8:1

    (c)

    2:3

    (d)

    1:3

  4. Which of the following statements made by Dalton has not undergone any change?

    (a)

    Atoms cannot be broken.

    (b)

    Atoms combine in small, whole numbers to form compounds.

    (c)

    Elements are made up of atoms.

    (d)

    All atoms of an elements are alike

  5. 2 x 1 = 2
  6. A negatively charged ion is called ____________, while positively charged ion is called ____________

    ()

      

  7. Proton is deflected towards the _________ charged plate (positively, negatively).

    ()

      

  8. 5 x 1 = 5
  9. Law of conservationof mass

  10. (1)

    Sir William Crookes

  11. Law of constant proportion

  12. (2)

    Lavoisier

  13. Cathode rays

  14. (3)

    James Chadwick

  15. Anode rays

  16. (4)

    Joseph Proust

  17. Neutrons

  18. (5)

    Goldstein

    4 x 2 = 8
  19. State the law of conservation of mass.

  20. Write the properties of anode rays.

  21. Define the term ions or radicals

  22. What is a chemical equation?

  23. 2 x 3 = 6
  24. Find the valency of the element which is underlined in the following formula.
    a) NaCl
    b) CO2
    c) Al (PO4)
    d) Ba (NO3)2
    e) CaCl2

  25. Write the skeleton equation for the following word equation and then balance them.
    a) Carbon + Oxygen → Carbon dioxide
    b) Phosphorus + Chlorine → Phosphorus pentachloride.
    c) Sulphur + Oxygen → Sulphur dioxide
    d) Magnesium + hydrogen → Magnesium + Hydrogen chloride chloride

  26. 1 x 5 = 5
  27. How can we prove that the electrons carry negative charge?

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