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| Q. |
Which one of the following mineral does not contain oxygen? |
| A. | Haematite |
| B. | Bauxite |
| C. | Cryolite |
| D. | Calcite |
| Answer» C. Cryolite | |
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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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