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Plaster of Pa...

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Plaster of Paris is prepared by heating one of the following to a temperature of 100°C. This is:
(a) CaSO₃.2H₂O
(b) CaCl₂.2H₂O
(c) CaCO₃.2H₂O
(d) CaSO₄.2H₂O

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Solution

(d) CaSO₄.2H₂O

When CaSO₄.2H₂O (gypsum) is heated to a temperature of 100⁰C (373K), it loses three-fourths of its water of crystallisation and forms plaster of Paris (CaSO₄.1/2H₂O).

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

Q. (a) What will happen if heating is not controlled while preparing plaster of Paris?
(b) Write an equation to show the reaction between plaster of Paris and water.

Q. Match List - I with List - II for the compositions of substances and select the correct answer using the code given below the list:

List -I	List - II
Substances	Composition
(A) Plaster of paris	(i) $C a S O_{4} \cdot 2 H_{2} O$
(B) Epsomite	(ii) $C a S O_{4} \cdot \frac{1}{2} H_{2} O$
(C) Kieserite	(iii) $M g S O_{4} \cdot 7 H_{2} O$
(D) Gypsum	(iv) $M g S O_{4} \cdot H_{2} O$
	(v) $C a S O_{4}$

Q. Match List - I with List - II for the compositions of substances and select the correct answer using the code given below the list:
List - I List - II
Substances Composition
(A) Plaster of paris (i)

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

(B) Epsomite (ii)

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

(C) Kieserite (iii)

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

(D) Gypsum (iv)

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

C a S O_{4}

Q. Which one of the following is the number of water molecules that share with two formula unit

C a S O_{4}

in plaster of Paris ?

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