First Mid Term Model Questions

12th Standard EM

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 50
    5 x 1 = 5
  1. Bauxite has the composition

    (a)

    Al2O3

    (b)

    Al2O3nH2O

    (c)

    Fe2O3.2H2O

    (d)

    None of these

  2. Wolframite ore is separated from tinstone by the process of

    (a)

    Smelting

    (b)

    Calcination

    (c)

    Roasting

    (d)

    Electromagnetic separation

  3. Considering Ellingham diagram, which of the following metals can be used to reduce alumina? (NEET-2018)

    (a)

    Fe

    (b)

    Cu

    (c)

    Mg

    (d)

    Zn

  4. AlF3 is soluble in HF only in the presence of KF. It is due to the formation of (NEET)

    (a)

    K3[AIF3H3]

    (b)

    K3[AiF6]

    (c)

    AIH3

    (d)

    K[AIF3H]

  5. The cation leaves its normal position in the crystal and moves to some interstitial position, the defect in the crystal is known as

    (a)

    Schottky defect

    (b)

    F center

    (c)

    Frenkel defect

    (d)

    non-stoichiometric defect

  6. 5 x 1 = 5
  7. Sulphide ore

  8. (1)

    Copper pyrite

  9. Cyclic silicates

  10. (2)

    FeO

  11. [CO(NH3)4Cl2]SO4

  12. (3)

    Ring silicates

  13. Metal deficiency defect

  14. (4)

    +4

  15. Pseudo first order reaction

  16. (5)

    involves at least two reactants

    5 x 2 = 10
  17. Describe a method for refining nickel

  18. Name the various refming process

  19. Give the structure of CO and CO2.

  20. What is an elementary reaction? Give the differences between order and molecularity of a reaction

  21. Rate of chemical reaction is not uniform throughout. Justify you answer:

  22. 5 x 3 = 15
  23. Explain the electrometallurgy of aluminium

  24. Explain calcination with an example.

  25. What are the uses of diborane?

  26. Why ionic crystals are hard and brittle?

  27. Show that in case of first order reaction, the time required for 99.9% completion is nearly ten times the time required for half completion of the reaction.
     

  28. 3 x 5 = 15
  29. Atoms X and Y form bcc crystalline structure. Atom X is present at the corners of the cube and Y is at the centre of the cube. What is the formula of the compound?

  30. What are stoichiometric defects in ionic solids? Explain

  31. The initial rate of a first order reaction is 5.2 x 10-6 mol lit-1 S-1 at 298 K. When the initial concentration of reactant is 2.6 x 10-3 mol.lit-1, calculate the first order rate constant of the reaction at the same temperature.

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