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Uses of Slaked Lime

Dead burnt pl...

Question

Dead burnt plaster is :

A

C a S O_{4}

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B

C a S O_{4} .12 H_{2} O

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C

C a S O_{4} . H_{2} O

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D

C a S O_{4} .2 H_{2} O

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Solution

The correct option is A $C a S O_{4}$
Dead burnt plaster is anhydrous calcium sulphate $C a S O_{4}$ . It is known as dead burnt because, it does not set like plaster of paris when moistioned with water.

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Similar questions

Q. When gypsum is heated to

393 K

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

List - I (Substances)	List - II (Composition)
A. Plaster of Paris	1. $C a S O_{4} .2 H_{2} O$
B. Epsomite	2. $C a S O_{4} . \frac{1}{2} H_{2} O$
C. Kieserite	3. $M g S O_{4} .7 H_{2} O$
D. Gypsum	4. $M g S O_{4} . H_{2} O$
	5. $C a S O_{4}$

Q. Plaster of Paris is known as calcium sulphate hemihydrate because two formula units of

C a S O_{4}

share one molecule of

H_{2} O

.

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}

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