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Uses of Calcium Carbonate

When gypsum i...

Question

When gypsum is heated to $393 K$ , it forms:

A

C a S O_{4} . \frac{1}{2} H_{2} O

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B

Dead burnt plaster

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C

C a S O_{4} .5 H_{2} O

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D

Anhydrous

C a S O_{4}

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Solution

The correct option is A $C a S O_{4} . \frac{1}{2} H_{2} O$
$C a S O_{4} .2 H_{2} O 393 K \to C a S O_{4} . \frac{1}{2} H_{2} O$

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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. Calcium sulphate,

C a S O_{4}

is a white crystalline substance. Gypsum is a mineral or natural substance that is hydrate of calcium sulphate.

1.032

g sample of gypsum contains

0.816

C a S O_{4}

. How many moles of water are contained in gypsum per mole of

C a S O_{4}

. Give your answer in nearest integer. (

C a = 40

S = 32

)

2.5 %

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

is also added to cement as one of the consituents its function is to:

Q. 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

Q. What is the product formed when hydrated

C a S O_{4}

125^{o} C

200^{o} C

?

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