Question

Assertion - Calcium sulphate hemihydrate is plaster of Paris
Reason- It is prepared by heating gypsum to a temperature of 373 K.
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Answer 1

Answer:

(b) both a and r are true

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Explanation:

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Answer 2

The correct answer is (a) Both assertion and reason are correct and the assertion is the correct explanation of the reason.

• Calcium sulphate hemihydrate is $CaSO_{4}.\frac{1}{2} H_{2}O$, which is popularly called Plaster of Paris, i.e. POP.
• When gypsum is heated at a temperature of about 373 K, then calcium sulphate hemihydrate can be obtained. Gypsum is calcium sulphate - $CaSO_{4}. 2\:H_{2}O$.
• In Paris, at Montmarte hills, large deposits of gypsum are present, from which POP is obtained. Hence, calcium sulphate hemihydrate is called Plaster of Paris.
• Thus, calcium sulphate hemihydrate is plaster of Paris as it is prepared from gypsum available in mountains in Paris. Thus, both assertion and reason statements are correct and the reason statement correctly explains the assertion statement.