The main constituent of egg-shells is: (A) ) \( \mathrm{CaCO}_{3} \) (B) \( \mathrm{CaSiO}_{3} \...

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The main constituent of egg-shells is:
(A) ) \( \mathrm{CaCO}_{3} \)
(B) \( \mathrm{CaSiO}_{3} \)
(C) ) \( \mathrm{CaSO}_{4} \cdot \frac{1}{2} \mathrm{H}_{2} \mathrm{O} \)
(D) \( \mathrm{CaSO}_{4} \cdot 2 \mathrm{H}_{2} \mathrm{O} \)
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