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12th Standard Chemistry Transition and Inner Transition Elements English Medium Free Online Test One Mark Questions 2020 - 2021

12th Standard

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Chemistry

Time : 00:20:00 Hrs
Total Marks : 20
    Answer all the questions
    20 x 1 = 20
  1. Sc( Z = 21) is a transition element but Zinc (z = 30) is not because

    (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. Among the transition metals of 3d series, the one that has highest negative \(\left( \frac { M^{ 2+ } }{ M } \right) \) standard electrode potential is

    (a)

    Ti

    (b)

    Cu

    (c)

    Mn

    (d)

    Zn

  3. The magnetic moment of Mn2+ ion is

    (a)

    5.92BM

    (b)

    2.80BM

    (c)

    8.95BM

    (d)

    3.90BM

  4. The catalytic behaviour of transition metals and their compounds is ascribed mainly due to

    (a)

    their magnetic behaviour

    (b)

    their unfilled d orbitals

    (c)

    their ability to adopt variable oxidation states

    (d)

    their chemical reactivity

  5. The alloy of copper that contain Zinc is

    (a)

    Monel metal

    (b)

    Bronze

    (c)

    bell metal

    (d)

    brass

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

    (a)

    oxalate

    (b)

    Carbon dioxi

    (c)

    acetate

    (d)

    acetic acid

  7. Permanganate ion changes to ________ in acidic medium

    (a)

    MnO42−

    (b)

    Mn2+

    (c)

    Mn3+

    (d)

    MnO2

  8. MnO4- react with Br- in alkaline PH to give

    (a)

    BrO3- MnO2

    (b)

    Br2, MnO42-

    (c)

    Br2, MnO2

    (d)

    BrO-, MnO42-

  9. Which of the following oxidation states is most common among the lanthanoids?

    (a)

    4

    (b)

    2

    (c)

    5

    (d)

    3

  10. The most common oxidation state of actinoids is

    (a)

    +2

    (b)

    +3

    (c)

    +4

    (d)

    +6

  11. The catalytic activity of transition metals is due to

    (a)

    the formation of a variety of oxidation states

    (b)

    the formation of intermediate products

    (c)

    the capability of forming interstitial compounds.

    (d)

    all the above

  12. 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

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

    (a)

    +4

    (b)

    +6

    (c)

    +8

    (d)

    +10

  14. 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

  15. Which of the following is coloured due to charge transfer?

    (a)

    MnO4-

    (b)

    CrO42-

    (c)

    Cu2O

    (d)

    All of these

  16. What are the species X and Y in the following?

    (a)

    CrO3, CrO3, Cr2O3

    (b)

    CrO3, Cr2O3

    (c)

    CrO4-2, Cr2O72-

    (d)

    H2CrO4, H2Cr2O7

  17. The correct statement is,

    (a)

    Cu2Cl2 and Ag2S are coloured

    (b)

    Upon strong heating paramagnetic gases are evolved by NaNO3 and AgNO3

    (c)

    Green vitriol and blue vitriol are isomorphus

    (d)

    KMnO4 and K2Cr2O7 are coloured due to

  18. On oxidation with KMnO4 in acidic medium, SO2 is oxidised to ___________

    (a)

    SO2

    (b)

    H2SO4

    (c)

    SO32-

    (d)

    H2S

  19. FeSO4 on heating gives ____________

    (a)

    SO2 and O2

    (b)

    SOand SO3

    (c)

    SO2

    (d)

    SO3

  20. _________ is known as Bayer's reagent.

    (a)

    Hot dilute alkaline KMnO4

    (b)

    Cold dilute alkaline KMnO4

    (c)

    Hot Conc. acidic KMnO4

    (d)

    Cold Conc. acidic KMnO4

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