Limestone, chalk and marble are different forms of .

Question

Question

This question was previously asked in

SSC CGL 2022 Tier-I Official Paper (Held On : 02 Dec 2022 Shift 2)

Answer 1

The correct answer is Calcium carbonate.

Key Points

Calcium Carbonate is a chemical compound with the formula CaCO_3.
It is a common substance found in rocks as the minerals calcite and aragonite (most notably as limestone, which is a type of sedimentary rock consisting mainly of calcite) and is the main component of eggshells, snail shells, seashells and pearls.
Mineral calcite and aragonite form limestone.
Minerals calcite and aragonite are different crystal forms of calcium carbonate.
When these minerals precipitate out of water containing dissolved calcium, limestone is formed.

Additional Information

Calcium Oxide (CaO), commonly known as quicklime or burnt lime, is a widely used chemical compound.
- It is a white, caustic, alkaline, crystalline solid at room temperature.
Calcium phosphate [Ca₃(PO₄)₂] is fundamental to the formation of teeth and bone.
- Calcium phosphate is a calcium salt of phosphoric acid. It is also known as Calcium phosphate tribasic or Tricalcium Phosphate.
Calcium Hydroxide [Ca(OH)₂] is also known as Slaked lime.
- It is a white powder or colourless crystal which is obtained when quicklime (calcium oxide) is mixed with water.