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Carbonaceous impurities in gypsum and an...

Carbonaceous impurities in gypsum and any fuel are avoided during preparation of Plaster of Paris. Explain.

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Carbonaceous impurities in gypsum and any fuel are avoided during preparation of Plaster of Paris because carbon will reduce `CaSO_4` to CaS.
`CaSO_4 + 4C to CaS + 4CO uarr`
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