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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

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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. When calcium sulphate is mixed with conc. HCl and the paste is formed. What colour is obtained wehn a pinch of this paste is brought near the flame?

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 ?

Why hydrated copper sulphate is blue while anhydrous copper sulphate is white?

With increase in temperature solubility of hydrated calcium sulphate

Give reasons for the following: a. Anhydrous calcium sulphate (anhydrite) cannot be used as plaster of Paris.

Plaster of Paris is chemically calcium sulphate monohydrate.

A : Magnesium sulphate is heptahydrate where as calcium sulphate is dihydrate. R : Mg and Ca belongs to Group II.

Name a suitable technique of the components from a mixture of calcium sulphate and comphor.

What happens when (a) magensium in burnt in air, (b) quicklime is heated with silica, (c ) chlorine reacts with slaked lime and (d) calcium nitrate is heated?

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