Plaster of Paris is prepared by heating one of the following to a temperature of $100^{o} C$ . This is :

(a) $C a S O_{3} 2 H_{2} O$

(b) $C a C l_{2} 2 H_{2} O$

(c) $C a C O_{3} .2 H_{2} O$

(d) $C a S O_{4} .2 H_{2} O$

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Solution

Plaster of Paris is prepared by heating gypsum [which is chemically calcium sulphate dihydrate ( $C a S O_{4} .2 H_{2} O$ ) at 373 K. On heating at 373 K, gypsum loses water molecules and becomes Plaster of Paris, which has the chemical name calcium sulphate hemihydrate. Its chemical formula is $C a S O_{4} . \frac{1}{2} H_{2} O$ . Following is the chemical equation for the reaction

$C a S O_{4} .2 H_{2} O Gypsum 373 K - -- \to C a S O_{4} . \frac{1}{2} H_{2} O Plaster of Paris + \frac{3}{2} H_{2} O$

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Similar questions

Plaster of Paris is prepared by heating which of the following compounds?

C a S O_{4} \cdot 2 H_{2} O

C a s O_{4} \cdot \frac{1}{2} H_{2} O

M a S O_{4} \cdot 7 H_{2} O

M g S O_{4} \cdot H_{2} O

C a S O_{4}

C a S O_{4}

(a) What is plaster of Paris? Write the chemical formula of plaster of Paris.

(b) How is plaster of Paris prepared? Write the chemical equation of the reaction involved.

(d) State two important uses of plaster of Paris.

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