Which of the following chemical compounds is known as marble?

Question

Question

This question was previously asked in

RRB Group D 17 Sept 2022 Shift 3 Official Paper

Answer 1

The correct answer is Calcium carbonate.

Key Points

Calcium carbonate
- Calcium carbonate, often known as CaCO3, may be found in almost every part of the planet and accounts for more than 4% of the crust of the earth.
- Chalk, limestone, and marble are their most prevalent forms in nature.
- These three stones were formed over the course of millions of years by the sedimentation of the fossilized shells of small fossilized snails, shellfish, and coral.
- Although there is no difference between any of the three forms in terms of their chemical composition, there are other ways in which they are distinct from one another, including purity, whiteness, thickness, and homogeneity.

Additional Information

Calcium oxide
- Cao is the chemical formula for calcium oxide.
- Calcium and oxygen are the two primary elements that makeup calcium oxide.
- In order to make it, calcium carbonate (like limestone) is heated to temperatures between 500 and 600 degrees Celsius in a special kiln called a lime kiln, where it breaks down into oxide and carbon dioxide.
Calcium bicarbonate
- Ca(HCO₃)₂ is the chemical formula for calcium bicarbonate, which is also known as calcium hydrogen carbonate.
- Calcium bicarbonate is often referred to as cleaning lime.
- Both sodium bicarbonate and this compound contain bicarbonate, which is composed of hydrogen, carbon, and oxygen atoms.
- The formation of caverns, stalagmites, and stalactites results in the production of cleansing lime, which only exists in liquid form.
Calcium hydroxide
- Calcium hydroxide, often known as slaked lime, is represented by the chemical formula Ca(OH)_2.
- In its solid form, this inorganic chemical appears white and powdery.
- On the other hand, crystallized Ca(OH)2 looks completely colorless.