Correct option is C
Plaster of Paris is obtained by the calcination (heating) of
gypsum. Gypsum (CaSO₄·2H₂O) is heated to about 150°C, which removes part of its water content, resulting in Plaster of Paris (CaSO₄·0.5H₂O).
Bauxite: The primary ore of aluminum, not related to Plaster of Paris.
Dolomite: A type of limestone containing magnesium, not used to make Plaster of Paris.
Gypsum: Correct, as it is heated to make Plaster of Paris.
Lime stone: Used to produce lime, not Plaster of Paris.
Therefore, the correct answer is (c) Gypsum.
