Question

The composition formula of gypsum is:
(A) ${(CaS{O_4})_2}{H_2}O$
(B) $2CaS{O_4}$
(C) $CaS{O_4}.2{H_2}O$
(D) $2CaS{O_4}.{H_2}O$

Answer 1

Hint : Gypsum is a typical mineral. It is found in layers that were shaped under salt water a long period of time prior. At the point when the water evaporated, it abandoned the mineral behind. One alternative to natural gypsum is Flue Gas Desulphurisation Gypsum, or FGD Gypsum. This is a by-product of coal-fired power stations.

Complete step by step solution:
Gypsum is mined from sedimentary stone formations around the globe. It appears as gems that can at times be discovered projecting from rock – prompting its early English name of the Spear Stone. The biggest gypsum quarries in Europe are found in France, Germany, Italy, Poland, Spain, and the UK. There is likewise proof of gypsum dunes on Mars.
Gypsum can be processed, blended in with water and afterward continue its unique stone-like state. This implies it very well may be molded and solidified. Gypsum likewise has a "shut reusing circle", which means it tends to be unendingly reused while keeping up high caliber.
Gypsum is composed of calcium sulphate ( $CaS{O_4}$ ) and water ( ${H_2}O$ ). Its chemical name is calcium sulphate dihydrate ( $CaS{O_4}.2{H_2}O$ ).
So, the composition formula of gypsum is $CaS{O_4}.2{H_2}O$ . It contains two moles of water in it.

Note:
Gypsum utilizes the assembling of wallboard, concrete, plaster of Paris, soil molding, a solidifying retarder in Portland concrete. Assortments of gypsum known as "glossy silk fight" and "alabaster" are utilized for an assortment of elaborate purposes; however, their low hardness restricts their durability.