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Question

Limestone is a sedimentary rock composed primarily of _________

This question was previously asked in
SSC CGL 2018 (Tier 2) Statistics Previous Year Paper (22-feb-2018)
The correct answer is

Calcium Carbonate

Limestone is a sedimentary rock composed primarily of calcium carbonate \(\left(\text{CaCO}_3\right)\), mostly in the mineral form of calcite. It forms either organically, from accumulated shells and skeletons of marine organisms such as corals, molluscs and foraminifera, or inorganically by direct precipitation from calcium-rich water.

Sodium chloride forms rock salt (halite), sodium bicarbonate is baking soda, and nitrogen oxides are gaseous pollutants — none of these forms limestone.

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