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Calcium sulphate is found in nature in t...

Calcium sulphate is found in nature in two forms, anhydrous calcium sulphate and hydrated calcium sulphate. When anhydrous calcium sulphate is heated with coke, sulphur dioxide gas is obtained. When hydrated calcium suphate is heated to `200^(@)`C, it forms anhydrous salt.
Q. The anhydrous calcium sulphate is called :

A

gypsum

B

anhydrite

C

plaster of paris

D

lime

Text Solution

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The correct Answer is:
B
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Calcium sulphate is found in nature in two forms, anhydrous calcium sulphate and hydrated calcium sulphate. When anhydrous calcium sulphate is heated with coke, sulphur dioxide gas is obtained. When hydrated calcium suphate is heated to 200^(@) C, it forms anhydrous salt. Q. What is the product formed when hydrated CaSO_(4) is heated to 125^(@) C instead of 200^(@)C ?

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