Periodic Classification of Elements Book Back Questions

10th Standard EM

    Reg.No. :
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Science

Time : 00:45:00 Hrs
Total Marks : 30
    2 x 1 = 2
  1. _____ is a relative periodic property

    (a)

    atomic radii

    (b)

    ionic radii

    (c)

    electron affinity

    (d)

    electronegativity

  2. ______ is an important metal to form amalgam

    (a)

    Ag

    (b)

    Hg

    (c)

    Mg

    (d)

    Al

  3. 3 x 1 = 3
  4. The scientist who propounded the modern periodic law is ________.

    ()

    Henry Moseley

  5. ________ and ________ are called inner transition elements

    ()

    Lanthanides, Actinides

  6. The chemical name of rust is____________

    ()

    hydrated ferric oxide

  7. 4 x 1 = 4
  8. Galvanisation

  9. (1)

    silver-tin amalgam

  10. Redox reaction

  11. (2)

    coating with Zn

  12. Dental filling

  13. (3)

    Alumino thermic process

  14. Group 18 elements

  15. (4)

    Noble gas elements

    3 x 2 = 6
  16. A is a reddish brown metal, which combines with O2 at < 1370 K gives B, a black coloured compound. At a temperature > 1370 K, A gives C which is red in colour. Find A,B and C with reaction.

  17. What is rust? Give the equation for formation of rust.

  18. State two conditions necessary for rusting of iron.

  19. 2 x 4 = 8
  20. a) State the reason for addition of caustic alkali to bauxite ore during purification of bauxite.
    b) Along with cryolite and alumina, another substance is added to the electrolyte mixture. Name the substance and give one reason for the addition

  21. Explain smelting process

  22. 1 x 7 = 7
  23. Metal A belongs to period 3 and group 13. A in red hot condition reacts with steam to form B. A with strong alkali forms C. Find A,B and C with reactions

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