Periodic classification of elements Book Back Questions

9th Standard

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Science

Time : 00:45:00 Hrs
Total Marks : 30
    5 x 1 = 5
  1. If Dobereiner is related with 'law of triads', then Newlands is related with
     

    (a)

    Modern periodic law

    (b)

    Hund's rule

    (c)

    Law of octaves

    (d)

    Pauli's Exclusion principle

  2. Modern periodic law states that the physical and chemical properties of elements are the periodic functions of their__________

    (a)

    atomic numbers

    (b)

    atomic masses

    (c)

    similarities

    (d)

    anomalies

  3. Elements in the modern periodic table are arranged in__________ groups and __________ periods.

    (a)

    7,18

    (b)

    18,7

    (c)

    17,8

    (d)

    8, 17

  4. The increasing order of the energy of subshells is

    (a)

    s>p>d>f

    (b)

    s<p<d<f

    (c)

    s<p<f<d

    (d)

    p<s<d<f

  5. If the electronic configuration of an element is 1s2 2S2 2p6 3s2 3p1, then it will occupy___________ block of the periodic table.

    (a)

    s

    (b)

    p

    (c)

    d

    (d)

    f

  6. 5 x 1 = 5
  7. In Dobereiner's triads, the atomic weight of the middle element is the _______of the atomic masses of 1st and 3rd elements.

    ()

    average

  8. Noble gases belong to________ group of the periodic table

    ()

    18th

  9. The basis of the classifications proposed by Dobereiner, Newlands and Mendeleev was____________

    ()

    atomic mass

  10. B, Si, Ge and As are the examples of___________

    ()

    metalloids

  11. Example for liquid metal is___________

    ()

    mercury

  12. 2 x 1 = 2
  13. Newland's periodic table is based on atomic masses of elements and modern periodic table is based on atomic number of elements.

    (a) True
    (b) False
  14. Metals can gain electrons

    (a) True
    (b) False
  15. 5 x 1 = 5
  16. Triads

  17. (1)

    Calcium

  18. Alkali metal

  19. (2)

    Dobereiner

  20. Law of octaves

  21. (3)

    Sodium

  22. Alkaline earth metal

  23. (4)

    Henry Moseley

  24. Modem Periodic Law

  25. (5)

    Newlands

    1 x 2 = 2
  26. State modern periodic law.

  27. 2 x 3 = 6
  28. What are groups and periods in the modern periodic table?

  29. What are the limitations of Mendeleev's periodic table?

  30. 1 x 5 = 5
  31. State any five features of modern periodic table.

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