Which one of the following materials contains calcium ?
[UPPSC 2019]
1) China clay
2) Corundum
3) Gypsum
4) Tale
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3) Gypsum
The correct answer is Gypsum.
Gypsum contains calcium.
Key Points
Gypsum is chemically known as calcium sulfate dihydrate is a compound of calcium.
Its formula is CaSO4. 2H2O.
It has about 29.4 percent calcium in the anhydrite form and 23.3 percent in the hydrous form.
Uses of Gypsum:
It is used as a fertilizer in the soils for plant growth.
it is also used in making chalks, plasters boards, etc.
Additional Information
China Clay:
Kaolinite is also known as China clay.
Kaolin is named after a hill in China (Kao-ling).
It’s chemical composition Al₂Si₂O₅(OH)₄.
It is used in the making of paper, paint, rubber.
Corundum:
Corundum is an aluminum oxide with a chemical composition of Al2O3 and a hexagonal crystal structure.
It is widely known for its extreme hardness.
Corundum is used to make industrial bearings, scratch-resistant windows for electronic instruments, circuit boards.
Talc:
Talc is a clay mineral formed with hydrated magnesium silicate.
The chemical formula is Mg₃Si₄O₁₀(OH)₂.
A form of talc is also known as “soapstone”.