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  • Question 1
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    The electrolytic reduction method for extraction of aluminium was discovered by:

  • Question 2
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    Alumina is not used as

  • Question 3
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    The purest zinc is made by:

  • Question 4
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    Directions For Questions

    Minerals from which metals can be extracted economically and easily are called ores. The extraction of metals from their ores involves the following processes.
    (i) Concentration.
    (ii) Calcination | roasting | leaching.
    (iii) Reduction.
    It is carried out by one of the following methods.
    (a) Carbon | carbon monoxide reduction.
    (b) Self-reduction.
    (c) Electropositive metal (i.e. displacment method).

    ...view full instructions

    Which of the following is not correctly matched?

  • Question 5
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    In our country, iron is obtained from the ore:

  • Question 6
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    In froth floatation process, for the purification of ores, the particles of the ore float because:

  • Question 7
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    Naturally occurring substances from which a metal can be profitably (or economically) extracted are called

  • Question 8
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    Which one of the following statements is incorrect? 

  • Question 9
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    Froth floatation process is used for concentration of

  • Question 10
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    Carbon monoxide reacts with iron to form

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