Question

Eggshell is made up of a chemical. In which of the two ores this chemical is present?

• A. Limestone: CaCO_3​, Dolomite: CaCO₃.MgCO₃
• B. Limestone: CaCO₃.MgCO₃​, Dolomite: CaCO₃
• C. Limestone: Ca₂CO₃, Dolomite:Ca₂CO₃.MgCO₃
• D. None of these

Answer 1

The correct option is A

Limestone: CaCO_3​, Dolomite: CaCO₃.MgCO₃

Explanation:

Eggshell:

• It is a semipermeable membrane, which means that air and moisture can pass through its pores.
• The shell also has a thin outermost coating called the bloom or cuticle that helps keep out bacteria and dust.
• Eggshells are made up of calcium carbonate $\left({\mathrm{CaCO}}_3\right)$ crystals.
• Limestone $\left({\mathrm{CaCO}}_3\right)$, Dolomite $({\mathrm{CaCO}}_3:{\mathrm{MgCO}}_3)$ are the two ores of calcium.

Hence, option (A) is correct.