New ! Chemistry MCQ Practise Tests



Unit test

12th Standard

    Reg.No. :
  •  
  •  
  •  
  •  
  •  
  •  

Chemistry

Use blue pen only
Time : 00:15:00 Hrs
Total Marks : 20

    Part - A

    Answer all the following questions

    5 x 1 = 5
  1. Bauxite has the composition ______.

    (a)

    Al2O3

    (b)

    Al2O3.nH2O

    (c)

    Fe2O3.2H2O

    (d)

    None of these

  2. Roasting of sulphide ore gives the gas (A).(A) is a colourless gas. Aqueous solution of (A) is acidic. The gas (A) is______.

    (a)

    CO2

    (b)

    SO3

    (c)

    SO2

    (d)

    H2S

  3. Which one of the following reaction represents calcinations?

    (a)

    \(2Zn+{ O }_{ 2 }\rightarrow 2ZnO\)

    (b)

    \(2ZnS+3O_{ 2 }\rightarrow 2ZnO+2SO_{ 2 }\)

    (c)

    \(MgCO_{ 3 }\rightarrow MgO+CO_{ 2 }\)

    (d)

    Both (a) and (c)

  4. The metal oxide which cannot be reduced to metal by carbon is ________.

    (a)

    PbO

    (b)

    Al2O3

    (c)

    ZnO

    (d)

    FeO

  5. Which of the metal is extracted by Hall-Heroult process?

    (a)

    Al

    (b)

    Ni

    (c)

    Cu

    (d)

    Zn

  6. 5 x 1 = 5
  7. I. All ores are minerals.
    II. All minerals are not ores.
    III. Aluminium can be extracted from bauxite.
    IV. Aluminium can be extracted from china clay.
    a) Only I
    b) Only II
    c) III & IV
    d) I, II & III

    A PHP Error was encountered

    Severity: Warning

    Message: A non-numeric value encountered

    Filename: material/details.php

    Line Number: 1002

    ()

    I, II, III

  8. I. Copper is the first metal used by the human
    II. Aluminuim is used in galvanising metals
    III. Aluminium is a good conductor of electricity
    IV. Magnets can be made from iron.
    a) Only I
    b) Only II
    c) I, III & IV
    d) III & IV

    A PHP Error was encountered

    Severity: Warning

    Message: A non-numeric value encountered

    Filename: material/details.php

    Line Number: 1002

    ()

     I, III & IV

  9. I. Ellingham diagram helps to select a suitable reducing agent.
    II. Magnesite is calcinated to obtain magnesia.
    III. Calcination is a process of cooling substances. 
    IV. Sulphur dioxide is harmful to the environment.
    a) I, II & IV
    b) Only II
    c) Only I
    d) III & IV

    A PHP Error was encountered

    Severity: Warning

    Message: A non-numeric value encountered

    Filename: material/details.php

    Line Number: 1002

    ()

    I, II & IV

  10. I. Froth flotation is used to concentrate sulphide ores.
    II. Magnetic separation is applicable for ferromagnetic ores.
    III. Roasting method used to sulphide ores to oxides
    IV. Magnetic separation is used to concentrate heavy oxide ores.
    a) III & IV
    b) Only II
    c) Only I
    d) I, II & III

    A PHP Error was encountered

    Severity: Warning

    Message: A non-numeric value encountered

    Filename: material/details.php

    Line Number: 1002

    ()

    I, II & III

  11. I. Ores are associated with non-metallic impurities
    II. Ores are associated with rocky materials
    III. Removal of impurities is known as concentration of ore.
    IV. Ellingham diagram shows the stability of different metal oxides.
    a) I, II, III & IV b
    b) Only II
    c) Only I
    d) III & IV

    A PHP Error was encountered

    Severity: Warning

    Message: A non-numeric value encountered

    Filename: material/details.php

    Line Number: 1002

    ()

    I, II, III & IV

  12. 5 x 2 = 10
  13. Assertion: Aluminium is used in the design of chemical reactors, medical equipments, refrigeration units and gas pipelines.
    Reason: Aluminium shows high resistance to corrosion
    Codes:
    a) Both (A) and (R) are true and (R) is the correct explanation of (A)
    b) Both (A) and (R) are true and (R) is not the correct explanation of (A).
    c) (A) true but (R) false
    d) Both (A) and (R) are false.

  14. Assertion: Metallic zinc is used in galvanising metals such as iron and steel.
    ReasonZinc is also used to produce die castings
    Codes:
    a) Both (A) and (R) are true and (R) is the correct explanation of (A).
    b) Both (A) and (R) are true and (R) is not the correct explanation of (A).
    c) (A) true but (R) false.
    d) Both (A) and (R) are false.

  15. Assertion: Zone refining is carried out in an inert gas atmosphere
    Reason: The metal is treated with a suitable reagent which can form a volatile compound with the metal.
    Codes:
    a) Both (A) and (R) are true and (R) is the correct explanation of (A).
    b) Both (A) and (R) are true and (R) is not the correct explanation of (A).
    c) (A) true but (R) false.
    d) Both (A) and (R) are false

  16. Assertion: Cuprite is concentrated by froth flotation process.
    Reason: Cuprite is the sulphide ore
    Codes:
    a) Both assertion and reason are true and the reason is the correct explanation of the assertion.
    b) Both assertion and reason are true but the reason is not the correct explanation of the assertion.
    c) Assertion is true, but reason is false.
    d) Both assertion and reason are false

  17. Assertion: Calamine and Dolomite are the Carbonate ores.
    Reason: Calamine is ZnCO3 whereas dolomite is MgCO3.ZnCO3.
    Codes:
    a) Both assertion and reason are true and the reason is the correct explanation of the assertion.
    b) Both assertion and reason are true but the reason is not the correct explanation of the assertion.
    c) Assertion is true, but reason is false.
    d) Both assertion and reason are false

  18. 5 x 2 = 10
  19. About "Electrolytic refining"
    a) The crude metal is refined by electrolysis.
    b) The rods of impure metal are used as cathode.
    c) Thin strips of pure metal are used as cathode.
    d) Less electropositive impurities removed as anode mud.

  20. About "Van-Arkel''
    a) Van-Arkel method used for refining Zirconium.
    b) Aluminium is a bad conductor of heat.
    c) Aluminium shows high resistance to corrosion.
    d) Aluminium is a good conductor of heat

  21. a) Aluminium is used to produce die-castings
    b) Gold nanopartides used as an catalysts
    c) Copper is the first metal used by the human
    d) Brass is an alloy of zinc and copper

  22. a) Germanium is used as an semi conductor
    b) Stainless steel is an important alloy of Aluminum
    c) Zinc sulphide is used in making luminous paints.
    d) Brass an alloy of zinc is used in water valves

  23. a) Metallic oxides can be reduced by an alumino thermic process.
    b) Flux + gangue \(\rightarrow\) slag
    c) Silica gangue present in the ore is basic in nature
    d) Cu2S + FeS \(\rightarrow\) Copper matter

  24. Generic 2
    * * *
  25. Write a note on Fisher tropsch synthesis.

  26. Give the structure of CO and CO2.

  27. Write a short note on hydroboration.

  28. Generic 3
    * * *
  29. Give the uses of silicones.

  30. What is burnt alum?

  31. Mention the uses of CO2.

  32. Generic 5
    * * *
  33. Write a notes on different types of silicones.

  34. Write note on the structure of diborane.

*****************************************

Reviews & Comments about Chemistry twelfth standard english medium chapter one important one mark questions

Write your Comment