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    General Principles And Processes of Isolation Of Elements

    Multiple Choice QuestionsMultiple Choice Questions

    221.

    Gravity separation process is used for the concentration of:

    • calamine

    • haematite

    • chalcopyrite

    • bauxite

    Answer
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    222.

    Which of the following is not an ore of magnesium?

    • Magnesite

    • Dolomite

    • Gypsum

    • Carnallite

    C.

    Gypsum

    Gypsum or CaSO4.2H2O is an ore of calcium.

    Dolomite or CaCO3.MgCO3; Magnesite or MgCO3 and Carnallite or KCl.MgCl2.6H2O are the ores of magnesium.

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    223.

    In Mc Arthur forest method, silver is extracted from the solution of Na[Ag(CN)2] by the use of:

    • Fe

    • Mg

    • Cu

    • Zn

    Answer
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