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Uses of Calcium Sulphate

The molecular...

Question

The molecular formula of gypsum is :

A

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

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B

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

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C

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

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D

C a S O_{4} .3 H_{2} O

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Solution

The correct option is B $C a S O_{4} .2 H_{2} O$
Gypsum is calcium sulphate dihydrate. Its molecular formula is $C a S O_{4} \cdot 2 H_{2} O$ . It is an ore of calcium.

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2.5 %

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

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

$C a S O_{4} .2 H_{2} O Δ 120^{\circ} C - ----- \to A - - + 3 H_{2} O . A$ is

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. Consider the following substances:
NaCl, Ca(OH)₂, NaHCO₃, NH₃, Na₂CO₃, H₂O, Cl₂, CO₂, CaSO₄.2H₂O, 2CaSO₄.H₂O, CaOCl₂
(a) Which two substance combine to form bleaching powder?
(b) Which four substances are utilised in the production of washing soda?
(c) Which compound represents plaster of Paris?
(d) Which compound is a part of baking powder?
(e) Which compound is used as an antacid?

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Uses of Calcium Sulphate

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