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Uses of Calcium Carbonate

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Question

You may have noticed that chicken-egg is very strong along its long axis so much so that it does not break even when pressed very hard. Which of the following is the main constituent of egg-shell ?

A

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

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B

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

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C

C a S i O_{3}

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D

C a C O_{3}

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Solution

The correct option is A $C a C O_{3}$
Chicken egg is very strong along its long axis with $C a C O_{3}$ as main constituent. The chicken egg shell is 95-97% calcium carbonate crystals, which ate stabilized by protein matrix.

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Similar questions

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)

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)

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

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

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

respectively. The respective values of their standard entropies are

194.0

130.0

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}

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

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

Q. Concrete is produced from a mixture of cement, water and small stones. 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)

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)

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

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

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

respectively. The respective values of their standard entropies are

194.0

130.0

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.

The value of equilibrium constant for reaction is:

Q. Which is main constituent of egg-shell?

Q. A commercial system removes

S O_{2}

emission from smoke at

95^{\circ} C

by the following set of reactions:

S O_{2} + C l_{2} \to S O_{2} C l_{2} (Yield = 75 %)

S O_{2} C l_{2} + 2 H_{2} O \to H_{2} S O_{4} + 2 H C l (Yield = 80 %)

H_{2} S O_{4} + C a (O H)_{2} \to C a S O_{4} + 2 H_{2} O (Yield = 100 %)

How many grams of

C a S O_{4}

may be produced from 3.78 g of

S O_{2}

?

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