Extraction of Aluminium

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  • Q1

    One of the products formed when red hot aluminium reacts with steam is aluminium oxide, the other product/s is/are

    Marks:1
    Answer:

    H2

    Explanation:

    Steam reacts with red hot aluminium to form aluminium oxide and hydrogen gas.

     

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  • Q2

    In electrolytic reduction of alumina, the electrolyte consists of fused

    Marks:1
    Answer:

    alumina, cryolite and fluorspar.

    Explanation:

    In electrolytic reduction of alumina, electrolyte contains a mixture of molten alumina (20%), cryolite (60%) and fluorspar (20%).

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  • Q3

    Na3AlF6 is the chemical formula of

    Marks:1
    Answer:

    cryolite.

    Explanation:

    Cryolite (Na3AlF6) is an ore of aluminium.

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  • Q4

    Bauxite ore is concentrated by

    Marks:1
    Answer:

    leaching.

    Explanation:

    Leaching is a chemical method used for the concentration of ore. In this method, the powdered ore is treated with a reagent in which the ore is soluble but the impurities are insoluble. This method is used for concentration of bauxite ore.

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  • Q5

    The principal ore of aluminium is

    Marks:1
    Answer:

    bauxite.

    Explanation:

    Bauxite is the principal ore of aluminium. It contains Al2O3 (about 60%), H2O, SiO2, Fe2O3 and TiO2.

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