Burning pyrites ore gives out:

Q. Burning pyrites ore gives out:
Answer: Sulphur dioxide gas
Notes: The mineral pyrite, such as iron pyrite or copper pyrite with formula FeS2 or CuS2. Pyrite remains in commercial use for the production of sulfur dioxide, for use in such applications as the paper industry, and in the manufacture of sulfuric acid as source of SO2.

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