Transition and Inner Transition Elements One Mark Question

12th Standard EM

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Chemistry

Time : 00:30:00 Hrs
Total Marks : 10
    10 x 1 = 10
  1. Sc( Z=21) is a transition element but Zinc (z=30) is not becaus

    (a)

    both Sc3+ and Zn2+ ions are colourless and form white compounds

    (b)

    in case of Sc, 3d orbital are partially filled but in Zn these are completely filled

    (c)

    last electron as assumed to be added to 4s level in case of zinc

    (d)

    both Sc and Zn do not exhibit variable oxidation states

  2. The correct order of increasing oxidizing power in the series

    (a)

    VO2+ < Cr2O72- < MnO4-

    (b)

    Cr2O72- < VO2+ < MnO4-

    (c)

    Cr2O72- < MnO4- < VO2+

    (d)

    MnO4- < Cr2O72- < VO2+

  3. The alloy of copper that contain Zinc is

    (a)

    Monel metal

    (b)

    Bronze

    (c)

    bell metal

    (d)

    brass

  4. In acid medium, potassium permanganate oxidizes oxalic acid to

    (a)

    oxalate

    (b)

    Carbon dioxi

    (c)

    acetate

    (d)

    acetic acid

  5. Which of the following statements is not true?

    (a)

    on passing H2S, through acidified K2Cr2O7 solution, a milky colour is observed

    (b)

    Na2Cr2O7 is preferred over K2Cr2O7 in volumetric analysis

    (c)

    K2Cr2O7 solution in acidic medium is orange in colour

    (d)

    K2Cr2O7 solution becomes yellow on increasing the PH beyond 7

  6. Which of the following is wrong with respect to lanthanide contraction?

    (a)

    Decrease in ionic radii

    (b)

    Increase in tendency to act as reducing agents

    (c)

    Decrease in basic character

    (d)

    Resembles second and third row of d-block elements

  7. Hybridisation of chromium ions and dichromate ions is

    (a)

    Sp2

    (b)

    Sp3d

    (c)

    both (a) and (b)

    (d)

    None of these

  8. The highest possible oxidation state shown by osmium in its compound is

    (a)

    +4

    (b)

    +6

    (c)

    +8

    (d)

    +10

  9. Identify the paramagnetic species

    (a)

    Cu+

    (b)

    Cr+

    (c)

    MnO4

    (d)

    Zn2+

  10. The trend in ionisation enthalpy of a transition element is not regular because,

    (a)

    removal of one electron alters the relative energies of 4s and 3d orbitals

    (b)

    due to different electronic configuration (stability)

    (c)

    Poor screening of 3p-orbital

    (d)

    due to decrease in effective nuclear charge

  11. 5 x 1 = 5
  12. Oxocations

  13. (1)

    Similar size

  14. Zr and Hf

  15. (2)

    Monazite sand

  16. Lanthanide

  17. (3)

    Rare earth elements

  18. Metallotherrnic

  19. (4)

    Lanthanido-therrnic process

  20. f - block elements

  21. (5)

    Actinides

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