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    CBSE

    Subject

    Chemistry
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    NEET Chemistry : General Principles And Processes of Isolation Of Elements

    Multiple Choice Questions

    41.

    Which of the following is not the correct match?

    • Leaching : Ag

    • Zone refining : Sn

    • Liquation : Pb

    • van Arkel : Zr

    Answer
    • 42.

    Aluminium becomes passive on treatment with :

    • dil. HNO3

    • conc. HNO3

    • dil. H2SO4

    • none of these

    Answer
    • 43.

    What is the role of aniline or cresol when added in a froth floatation process?

    • Stabilizer

    • Depressant

    • Wetting agent

    • All of these

    Answer
    • 44.

    Slag formed in blast furnace, removes the impurity of

    • SiO2

    • CaO

    • CO2

    • FeO

    Answer
    • 45.

    Which method is not used for the extraction of Al ?

    • Van - Arkel

    • Serpeck

    • Baeyer

    • Hall - Heroult

    Answer
    • 46.

    Maximum number of molecules of CH3I that can react with a molecule of CH3NH2 are :

    • 3

    • 4

    • 2

    • 1

    Answer
    • 47.

    Oils can be converted into fats by :

    • hydrogenolysis

    • hydrogenation

    • decarboxylation

    • hydration

    Answer
    • 48.

    Important ore of zinc is :

    • calamine

    • cryolite

    • zinc blende

    • malachite

    Answer
    • 49.

    When CO2 is passed through solution of sodium aluminate, precipitate of which compound is formed?

    • Al(OH)3

    • Al2O3

    • Na2CO3

    • No ppt

    Answer
    • 50.

    The purpose of smelting an ore is to :

    • oxidise it

    • reduce it

    • obtain an alloy

    • separate volatile impurities

    Answer
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