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

12th Standard

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Chemistry

Time : 00:20:00 Hrs
Total Marks : 20
    20 x 1 = 20
  1. Which of the following d block element has half filled penultimate d sub shell as well as half filled valence sub shell?

    (a)

    Cr

    (b)

    Pd

    (c)

    Pt

    (d)

    none of these

  2. Which of the following compounds is colourless?

    (a)

    Fe3+

    (b)

    Ti4+

    (c)

    Co2+

    (d)

    Ni2+

  3. 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+

  4. Which of the following does not give oxygen on heating?

    (a)

    K2Cr2O7

    (b)

    (NH4)2Cr2O7

    (c)

    KClO3

    (d)

    Zn(ClO3)2

  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. A white crystalline salt (A) react with dilute HCl to liberate a suffocating gas (B) and also forms a yellow precipitate . The gas (B) turns potassium dichromate acidified with dil H2SO4 to a green coloured solution(C).  A, B and C are respectively

    (a)

    Na2SO3, SO2, Cr2(SO4)3

    (b)

    Na2S2O3, SO2, Cr2(SO4)3

    (c)

    Na2S, SO2,Cr2(SO4)3

    (d)

    Na2SO4, SO2, Cr2(SO4)3

  7. When a brown compound of Mn (A) ids treated with HCl , it gives a gas (B) . The gas (B) taken in excess reacts with NH3 to give an explosive compound (C). The compound A, B and C are

    (a)

    MnO2, Cl2 , NCl3

    (b)

    MnO, Cl2 , NH4Cl

    (c)

    Mn3O4, Cl2 , NCl3

    (d)

    MnO3, Cl2 , NCl2

  8. Which of the following lanthanoid ions is diamagnetic?

    (a)

    Eu2+

    (b)

    Yb2+

    (c)

    Ce2+

    (d)

    Sm2+

  9. Assertion : Ce4+ is used as an oxidizing agent in volumetric analysis.
    Reason: Ce4+ has the tendency of attaining +3 oxidation state.
    Codes:
    (a) Both assertion and reason are true and reason is the correct explanation of assertion.
    (b) Both assertion and reason are true but reason is not the correct explanation of assertion.
    (c) Assertion is true but reason is false.
    (d) Both assertion and reason are false.

    (a)

    Both assertion and reason are true and reason is the correct explanation of assert

    (b)

    Both assertion and reason are true but reason is not the correct explanation of assertion.

    (c)

    Assertion is true but reason is false.

    (d)

    Both assertion and reason are false.

  10. The actinoid elements which show the highest oxidation state of +7 are

    (a)

    Np, Pu ,Am

    (b)

    U, Fm, Th

    (c)

    U, Th, Md

    (d)

    Es, No, Lr

  11. Most of the transition metal ions are coloured, because of the

    (a)

    presence of unpaired electrons

    (b)

    energy gap between two energy levels is very small

    (c)

    both (a) and (b)

    (d)

    neither (a) nor (b)

  12. Hybridisation of chromium ions and dichromate ions is

    (a)

    Sp2

    (b)

    Sp3d

    (c)

    both (a) and (b)

    (d)

    None of these

  13. Identify the paramagnetic species

    (a)

    Cu+

    (b)

    Cr+

    (c)

    MnO4

    (d)

    Zn2+

  14. Oxygen stabilises higher oxidation state because

    (a)

    it is electronegative

    (b)

    of its tendency to form multiple bond

    (c)

    of large size

    (d)

    of small size

  15. Ce (Z=58) and Yb (Z=70) exhibits stable +4 and +2 oxidation states respectively. This is because

    (a)

    Ce4+ and Yb2+acquire f7 configuration

    (b)

    Ce4+ and Yb2+ acquire f0 configuration

    (c)

    Ce4+ and Yb2+acquire fand f14 configuration

    (d)

    Ce4+and Yb2+ acquire f0 and f14 configuration

  16. The landthanide contraction is responsible for the fact that

    (a)

    Zr and Zn have the same oxidation state

    (b)

    Zr and Hf have almost the same radius

    (c)

    Zr and Nb have similar oxidation state

    (d)

    Zr and Y have similar radius

  17. Identify the correct reason for lanthanide contraction

    (a)

    Decreasing nuclear charge

    (b)

    Decreasing screening effect

    (c)

    Increasing nuclear charge

    (d)

    Negligible screening effect

  18. Electrode potential of M2+/M for Ni is abnormal because of _________

    (a)

    high lE1 + E2

    (b)

    high hydration energy

    (c)

    ΔH atomisation

    (d)

    Electronic configuration of Ni2+

  19. The general electronic configuration of d-block elements can be written as __________

    (a)

    [Noble gas]n - 1d1-10 ns1-2

    (b)

    [Noble gas]n - 1d-10 n1-6

    (c)

    [Noble gas]n - 2 d10 ns1-2

    (d)

    [Noble gas]n - 2 d10 ns1-6

  20. The element corresponding to the electronic configuration [Rn]5f3 6d17sis _________

    (a)

    Neptunium

    (b)

    Plutonium

    (c)

    Uranium

    (d)

    Americium

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