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General Principle of Extraction of Metal Test - 7

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General Principle of Extraction of Metal Test - 7
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  • Question 1
    4 / -1

    In blast furnace, the iron oxide is reduced by:

    Solution

    Hint: A more reactive element is used to reduce iron, so it can displace iron from iron(III) oxide.

    Explanation:

    The production of iron from its ore involves an oxidation-reduction reaction carried out in a blast furnace.

    Carbon monoxide CO is used to reduce iron because carbon is a more reactive element than iron.

    Carbon reacts with oxygen to form carbon monoxide and then that carbon monoxide reacts with iron oxide to form elemental iron.
    The reactions are as shown below:

     

  • Question 2
    4 / -1

    Furnaces are lined with calcium oxide because

    Solution

    Furnaces are lined with calcium oxide because it is refractory and basic.

     

     

  • Question 3
    4 / -1

    Alumina

    Solution

    Alumina is a bad conductor of electricity.

     

  • Question 4
    4 / -1

    Aluminium is prepared in large quantities by

    Solution

    Aluminium is prepared in large quantities by electrolysing aluminium oxide dissolved in fused electrolyte.

     

  • Question 5
    4 / -1

    After partial roasting , the sulphide of copper is reduced by

    Solution

    Ans− Self reduction :- Reduction of oxide ore of a metal by its own sulphide

    2Cu2​O+Cu2​S→6Cu+SO2​

     

  • Question 6
    4 / -1

    High purity copper metal is obtained by:

    Solution

    High purity copper metal (nearly 99.99%) is obtained by electrolytic reduction. A schematic is shown in the attached image.

     

  • Question 7
    4 / -1

    Cupellation process is used in the metallugry of

    Solution

    Cupellation method is used when the impure metals contain impurity of another metal which forms volatile oxide.

     

  • Question 8
    4 / -1

    Metals are:

    Solution

    Metals are electropositive elements because they have tendency to loosee− and forms + ve ions

    Na → Na+ + e

     

  • Question 9
    4 / -1

    Electrolytic refining is used for refining of :

    Solution

    Electrolytic refining is the process of refining of metal in which impure metal is made the anode and a thin strip of pure metal is made the cathode. A solution of metal salt is used as an electrolyte. 

    Electrolytic refining is best used for the refining of Cu.

     

  • Question 10
    4 / -1

    Van Arkel method of purification of metals involves converting the metal to a:

    Solution

    Van Arkel method of purification of metals involves converting the metal to a volatile stable compound.

    For example,  Ni is heated with CO to form  volatile Ni(CO)4​

     

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