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Which one of the following mineral does not contain oxygen

This question belongs to General Knowledge Chemistry
Chemistry
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Which one of the following mineral does not contain oxygen ?

Answer & Solution
Correct Answer: Option C
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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