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General Principles and Processes of Isolation of Elements Test - 8

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General Principles and Processes of Isolation of Elements Test - 8
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  • Question 1
    1 / -0

    Calamine is an ore of

    Solution

    Calamine is a historic name for an ore of zinc. The name calamine was derived from lapis calaminaris, a Latin corruption of Greek cadmia, the old name for zinc ores in general. The name of the Belgian town of Kelmis, La Calamine in French, which was home to a zinc mine, comes from that

  • Question 2
    1 / -0

    In blister copper, the blisters are formed due to passing out of

    Solution

    The blisters are formed due to passing out of SO2.

    2FeS + 3O2 → 2FeO + 2SO2

    FeO + SiO2 → FeSiO3

    2Cu2S + 3O2 →2Cu2O + 2SO2

    2Cu2O + Cu2S → 6Cu + SO2

  • Question 3
    1 / -0

    For obtaining high purity metals, which of the following methods of refining is preferred?

    Solution

    Zone refining is used for refining high purity metals, since it is based on principle that impurities are more soluble in the melt than the solid state of metal.

  • Question 4
    1 / -0

    The second most abundant metal on earth’s crust is

    Solution

    Iron is 2nd most abundant metal in earth's crust around 5 %.

  • Question 5
    1 / -0

    Which of the following chemical is used as a depressant in separating ZnS from PbS in froth floatation process?

    Solution

    NaCN combines with Zn to form water soluble complex which prevents it from coming to froth and it makes sure that PbS comes to the froth.

  • Question 6
    1 / -0

    When the impurity is silica, which of the following can be used as flux?

    Solution

    SiO2 is acidic so flux can be basic. Here remaining options are metallic oxides and hence basic in nature.

  • Question 7
    1 / -0

    Percentage of carbon in cast iron is

    Solution

    Cast iron is made by melting pig iron with scrap iron and coke using hot air blast. It has 3% of carbon content and is extremely hard and brittle.

  • Question 8
    1 / -0

    Which of the following substance can be used for drying gases?

    Solution

    Anhydrous CaO is used as drying gas, which absorbs water vapors.

  • Question 9
    1 / -0

    In blast furnace, the highest temperature is in

    Solution

    Combustion zone maintains the highest temperature around 1775 K.

    e.g. extraction of Fe

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