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Fluorogypsum, used in super sulphated cement or as binding agents, is a waste product of manufacture of:

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Fluorogypsum, used in super sulphated cement or as binding agents, is a waste product of manufacture of:

(a) Fluorine

(b) Thermal power

(c) Hydrofluoric acid

(d) Phosphoric acid
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Correct option is (c) Hydrofluoric acid

Explanation: Phosphogypsum is a waste product of Phosphoric acid manufacture and flyash is of thermal power plants.  Fluorogypsum is purified by neutralising its acidity and then can be used for bricks, tiles, plastering, etc.
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