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Transition and Inner Transition Elements

12th Chemistry - Transition and Inner Transition Elements Model Question Paper

Transition and Inner Transition Elements Model Question Paper

12th Standard

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 40
    6 x 1 = 6

  1. In acid medium, potassium permanganate oxidizes oxalic acid to _______.

    (a)

    oxalate

    (b)

    Carbon dioxide

    (c)

    acetate

    (d)

    acetic acid

  2. Which one of the following statements related to lanthanons is incorrect?

    (a)

    Europium shows +2 oxidation state

    (b)

    The basicity decreases as the ionic radius decreases from Pr to Lu.

    (c)

    All the lanthanons are much more reactive than aluminium

    (d)

    Ce4+ solutions are widely used as oxidising agents in volumetric analysis.

  3. Hybridisation of chromium ions and dichromate ions is ________.

    (a)

    Sp2

    (b)

    Sp3d

    (c)

    both (a) and (b)

    (d)

    None of these

  4. 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

  5. In black and white photography, the developed film is fixed by washing with ______.

    (a)

    Hypo solution

    (b)

    AgBr solution

    (c)

    Na2S4O6 solution

    (d)

    FeC2O4 solution

  6. A mixture of TiCl4 and trialkyl aluminium is _________

    (a)

    hydroformylation of obfine

    (b)

    Zeigler - Natta Catalyst

    (c)

    interstitial compounds

    (d)

    ferromagnetic

    7. 2 x 1 = 2

  7. I . Alloys are formed by bleding a metal.
    II. Alloys are formed by bleding a non-metal.
    II. Alloys have high melting points.
    IV. Alloys have low melting points.
    a) I and II only
    b) III and IV only
    c) I, II and III only
    d) I, II, III and IV

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    c) I, II and III only

  8. Choose the correct statement: SO3 vanadium pentoxide is used as a catalyst to oxide SO2 In this reaction V2O5 is ______.
    a) Vanadium pentoxide is Oxidised
    b) Reduced to Vanadium (IV) Oxide (VO2)
    c) Vanadium (IV) Oxide is oxidised
    d) Oxidised to Vanadium IV Oxide

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    reduced to vanadium (IV) Oxide (VO2)

    9. 3 x 2 = 6

  9. Assertion: All Cr-O bond length in K2Cr2O7 are equal.
    Reason: Both the Cr are present in dsp2 hybrid state.
    Codes:
    a) Both assertion and reason are true and reason is the correct explanation of the assertion.
    b) Both assertion and reason are true but reason is not the correct explanation of the assertion.
    c) Assertion is true but reason is false.
    d) Both assertion and reason are false

  10. Assertion: Cr2O72- becomes equilibrium with Cro42- at pH > 5
    Reason: Cr2O72- tetrahedral having Cr-O-Cr angle 109o28.
    Codes:
    a) Both assertion and reason are true and reason is the correct explanation of the assertion.
    b) Both assertion and reason are true but reason is not the correct explanation of the assertion.
    c) Assertion is true but reason is false.
    d) Both assertion and reason are false.

  11. Assertion: Potassium-di-chromate is a powerful oxidising agent acidic medium
    Reason: The Oxidation state of chromium changes from Cr6+ to Cr3+
    Codes:
    a) Assertion and reason are correct
    b) Assertion is correct reason is wrong.
    c) Assertion is wrong reason is correct.
    d) Both Assertion and reason are wrong

    12. 1 x 2 = 2

  12. About "Potassium permanganate"
    a) Potassium permanganate is prepared from pyrolusite ore.
    b) It melts at 513 k.
    c) It boils at 50oC
    d) It exits in the form of dark purple crystals.

    13. 4 x 2 = 8

  13. What are inner transition elements?

  14. Describe the preparation of potassium dichromate.

  15. Write the outer electronic configuration of Cr atom (Z=24).

  16. Complete the following equations.
    (i) 2 CrO42- + 2H+ ⟶
    (ii) KMnO4 ⟶

    17. 2 x 3 = 6

  17. Write the electronic configuration of Ce4+ and Co2+.

  18. What are redox reactions?

    19. 2 x 5 = 10

  19. Which is stronger reducing agent Cr2+ or Fe2+?

  20. How are materials classified based on their magnetic properties?

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