Plaster of Paris has the formula:

C a S O_{4} . (1 / 2) H_{2} O

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

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

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none of the above

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Solution

The correct option is A $C a S O_{4} . (1 / 2) H_{2} O$
Plaster of Paris is obtained by heating gypsum to 373 K.
$2 C a S O_{4} .4 H_{2} O + H e a t \to 2 C a S O_{4} . H_{2} O + 3 H_{2} O$

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Similar questions

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

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

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

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 ?

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

M a 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}

$\begin{matrix} List I & List II 1. Plaster of Paris & a. C a S O_{4} .2 H_{2} O 2. Epsomite & b. C a S O_{4} .1 / 2 H_{2} O 3. Kieserite & c. M g S O_{4} .7 H_{2} O 4. Gypsum & d. M g S O_{4} . H_{2} O e. C a S O_{4} \end{matrix}$

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Plaster of Paris has the formula:

The correct option is A CaSO4.(1/2)H2OPlaster of Paris is obtained by heating gypsum to 373 K.2CaSO4.4H2O+Heat→2CaSO4.H2O+3H2O

The correct option is A $C a S O_{4} . (1 / 2) H_{2} O$
Plaster of Paris is obtained by heating gypsum to 373 K.
$2 C a S O_{4} .4 H_{2} O + H e a t \to 2 C a S O_{4} . H_{2} O + 3 H_{2} O$