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  1. Which one of the following mineral does not contain oxygen ?

    2. A.

     Haematite
    B.

     Bauxite
    C.

     Cryolite
    D.

     Calcite

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    Answer : Option C

    Explanation :

    Cryolite (Na3AlF6, sodium hexafluoroaluminate) does not contain oxygen. It occurs as glassy, colorless, white-reddish to gray-black prismatic monoclinic crystals. Cryolite is used as an insecticide and a pesticide. It is also used to give fireworks a yellow color.

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