Periodic classification of elements Model Question Paper

9th Standard

    Reg.No. :
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Science

Time : 01:30:00 Hrs
Total Marks : 50
    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. 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

  4. The maximum number of electrons that can be accommodated in s, p ,d, and f subshells are__________

    (a)

    14, 10,6,2

    (b)

    6, 10,2, 14

    (c)

    2,6, 10, 14

    (d)

    6,2, 14, 10

  5. Which block of the periodic table contains metals, non-metals and metalloids?

    (a)

    s

    (b)

    p

    (c)

    d

    (d)

    f

  6. 6 x 1 = 6
  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. The basis of the classifications proposed by Dobereiner, Newlands and Mendeleev was____________

    ()

    atomic mass

  9. Example for liquid metal is___________

    ()

    mercury

  10. ___________group elements are called alkaline earth metals.

    ()

    Second

  11. f-block elements are also know as_______

    ()

    inner transition elements

  12. __________is the only non-metals which can conduct heat.

    ()

    Diamond

  13. 5 x 1 = 5
  14. 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
  15. Metals can gain electrons

    (a) True
    (b) False
  16. Alloys bear the characteristics of both metals and non-metals.

    (a) True
    (b) False
  17. Lanthanides and actinides are kept at the bottom of the periodic table because they resemble each other but they do not resemble with any other group elements.

    (a) True
    (b) False
  18. Group 17 elements are named as halogens.

    (a) True
    (b) False
  19. 5 x 1 = 5
  20. Triads

  21. (1)

    Henry Moseley

  22. Alkali metal

  23. (2)

    Dobereiner

  24. Modem Periodic Law

  25. (3)

    Sodium

  26. Calcium

  27. (4)

    transition metal

  28. Sodium

  29. (5)

    alkali metal

    4 x 2 = 8
  30. What are s-block elements?

  31. What are alloys?

  32. State Mendeleev's Law of Periodicity

  33. State Newlands' Law of Octaves

  34. 2 x 3 = 6
  35. What are groups and periods in the modern periodic table?

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

  37. 3 x 5 = 15
  38. State any five features of modern periodic table.

  39. List the advantages of alloys

  40. Write the advantages of Modern Periodic Table

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