Limestone is a sedementary rock composed primarily of ______

Options

A. Nitrogen Oxide
B. Calcium Carbonate
C. Sodium Chloride
D. Sodium bicarbonate

Answer

B

Explanation

Limestone is a sedimentary rock, composed mainly of skeletal fragments of marine organisms such as coral, forams and molluscs. It is composed mainly of calcium carbonate `(CaCo_3)`. usually in the form of calcite or arago-nite.