1.

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

Answer» 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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