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General Principles and Processes of Isolation of Elements Test - 7

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General Principles and Processes of Isolation of Elements Test - 7
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  • Question 1
    1 / -0

    In the extraction of nickel by Mond’s process, the metal is obtained by

    Solution

    Ni is first reacted with CO to form Nickel tetracarbonyl which is volatile which decomposes to give Nickel.

  • Question 2
    1 / -0

    Blister copper is about

    Solution

    Blister copper contains is 98% Cu and very small percentage of other impurities.

  • Question 3
    1 / -0

    Refining of silver is done by

    Solution

    In this method, the impure metal acts as anode. A strip of same pure metal is used as cathode. A salt of metal is made an electrolyte. On passing electricity through the solution, the pure metal moves towards the cathode, and impurities present in the anode settle down at the bottom as anode mud.

  • Question 4
    1 / -0

    Which among the following is a method of concentration of ore?

    Solution

    Leaching is method of concentration of ore in which ore is digested with particular solvent to form a soluble complex leaving behind the impurities.

  • Question 5
    1 / -0

    The slag obtained during the extraction of copper from copper pyrites is composed of

    Solution

    FeO is present as impurity and SiO2 is flux added.

    FeO + SiO2 → FeSiO3 (slag)

  • Question 6
    1 / -0

    Which of the following ore contains both Mg and Ca?

    Solution

    Dolomite is MgCO3. CaCO3. The amount of calcium and magnesium in most specimens is equal, but occasionally one element may have a slightly greater presence than the other. Small amounts of iron and manganese are sometimes also present.

  • Question 7
    1 / -0

    Metal halides are found in lakes and seas because

    Solution

    Metal halides found in sea or lakes, since they get dissolved in rain water and collected in the sea or lakes.

  • Question 8
    1 / -0

    An ore has impurities which are lighter than the ore. The process used for the concentration of ore is

    Solution

    This is hydraulic washing or gravity separation. Here when stream of water is passed it takes away all the lighter impurities with it and the heavier ore particles are left behind.

  • Question 9
    1 / -0

    Leaching of gold is done by

    Solution

    Cyanide forms soluble complex with the gold from which metal is obtained by replacement.

  • Question 10
    1 / -0

    The reducing agent used in the blast furnace to reduce haematite to iron is

    Solution

    CO is used as reducing agent in blast furnace to get iron at such a high temperature.

    3 Fe2O3 + CO → 2 Fe3O4 + CO2

    Fe3O4 + 4 CO → 3Fe + 4 CO2

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