CaSO 4- 2 H 2 O - 120- C - A -3 H 2 O - A isA- 2 CaSO 4- H 2 OB- CaSO 4- H 2 OC- CaSO 4- 3 H 2 OD- CaSO 4- 2 H 2 O

The correct option is A 2CaSO4 . H2O Gypsum when heated to 120^∘C loses three forth water to form plaster of paris. ...

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Standard IX

Chemistry

Water of Crystallization

CaSO 4· 2 H 2...

Question

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

2CaSO₄ . H₂O

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CaSO₄.H₂O

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CaSO₄. 3H₂O

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CaSO₄ . 2H₂O

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Solution

The correct option is A
2CaSO₄ . H₂O

Gypsum when heated to $120^{\circ} C$ loses three forth water to form plaster of paris.

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Similar questions

Find the number of moles of $C a S O_{4} .2 H_{2} O$ present in $3.011 \times 10^{24}$ formula units of $C a S O_{4} .2 H_{2} O$

Q. Concrete is produced from a mixture of cement, water and small stones. A small amount of gypsum,

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

is added in cement production to improve the subsequent hardening of concrete.
The elevated temperature during the production of cement may lead to the formation of unwanted hemihydrate

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

according to reaction.

C a S O_{4} \cdot 2 H_{2} O (s) \to C a S O_{4} \cdot \frac{1}{2} H_{2} O (s) + \frac{3}{2} H_{2} O (g)

The

Δ_{f} H^{⊖}

C a S O_{4} \cdot 2 H_{2} O (s), C a S O_{4} \frac{1}{2} H_{2} O (s), H_{2} O (g)

are

- 2021.0 k J m o l^{- 1}

- 1575.0 k J m o l^{- 1}

and

- 241.8 k J m o l^{- 1}

respectively. The respective values of their standard entropies are

194.0

130.0

and

188.0 J K^{- 1} m o l^{- 1} .

R = 8.314 J K^{- 1} m o l^{- 1} = 0.0831 L b a r m o l^{- 1} K^{- 1}

Answer the follwoing questions on the basis of above information.

Heat change occuring during conversion of

1 K g

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

(molar mass 172 g mol

^{- 1}

) of

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

is equal to:

Q. 0.5 moles of

H_{2} S O_{4}

is mixed with 0.2 moles of

C a (O H)_{2} .

The maximum number of moles of

C a S O_{4}

formed is:
Reaction:

H_{2} S O_{4} + C a (O H)_{2} \to C a S O_{4} + 2 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

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}

Q. Calculate the moles of

C a S O_{4}

present in a pure sample of 1360 g

C a S O_{4} .

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CaSO4.2H2O Δ120∘C−−−−−−→ A–– + 3H2O.A is

The correct option is A 2CaSO4 . H2O Gypsum when heated to 120∘C loses three forth water to form plaster of paris.

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

The correct option is A
2CaSO₄ . H₂O

Gypsum when heated to $120^{\circ} C$ loses three forth water to form plaster of paris.