Limestone is a naturally occuring form of calcium carbonate. It is used as building materials and also for manufacture of other building materials such as portland cement. It is used for the production of quicklime and slaked lime which have wide applications in chemical, metallurgical and construction industry. The pure `CaCO_(3)`, called precipitated calcium carbonate, is used extensively as filler, providing bulk to materials such as paint, plastics, printing links and rubber. it is also used in toothpastes, cosmetics and antacids. Quicklime and slaked lime are the cheapest and the most widely used bases for neutralising unwanted acids. Lime is used to neutralise acidic soils. An important application of quicklime is in air pollution control for the removal of `SO_(2)` in electric power plants. slaked lime is used in the manufacture of other alkalis and bleaching powder, in sugar refining, in tanning hide and in water softening.
The substance not likely to contain `CaCO_(3)` is

Options

A. dolomite
B. a marble statue
C. sea shells
D. calcined gypsum

Answer

D