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Reactivity Trends (Group 2)

The anhydrous...

Question

The anhydrous calcium sulphate is called :

A

gypsum

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B

anhydrite

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C

plaster of Paris

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D

lime

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Solution

The correct option is D anhydrite
Anhydrite is a mineral of anhydrous calcium sulfate.
Gypsum salt is $C a S O_{4} .2 H_{2} O$ .
Lime: CaO.
Plaster of paris: $2 C a S O_{4} . H_{2} O$ .

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Why calcium sulphate hemihydrate is called plaster of Paris?

Q. Calcium sulphate is found in nature in two forms, anhydrous calcium sulphate and hydrated calcium sulphate is heated with coke, sulphur dioxide gas is obtained. When hydrated calcium sulphate is heated at

200^{o} C

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When calcium sulphate is mixed with conc.

H C l

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Q. Answer the questions below, relating your answers only to salts in the following list:
sodium chloride, anhydrous calcium chloride, copper sulphate-5-water.
(i) What is the name given to the water in the compound copper sulphate-5-water?
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Q. Heated calcium sulphate with half a water of crystallization is commonly called as:

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