The main constituents of pearl are

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Ammonium sulphate and sodium carbonate

Aragonite and conchiolin.

Calcium carbonate and magnesium carbonate

Calcium oxide and ammonium chloride

answer is B.

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Detailed Solution

concept - A pearl is a hard, shiny object formed in the soft tissue (specifically, the shell) of a living mollusc or other animal, such as fossil Conulariids.
The shape, size, and colour of pearls vary among different types of pearls. In most cases, pearls are irregular in shape and perfectly round pearls are rare.
Chemical composition of pearls:
(i) Calcium carbonate (

{CaCO}_{3}

) or aragonite. It is present as 88-90%.
(ii) Organic conchiolin Special type of scleroprotein 3.5-5.9%.
(iii) Water 2-4%.
(iv) Rest 0.1-0.8%.
Thus, the main constituent of pearl is aragonite, which is calcium carbonate and Conchiolin present in molluscs' outer shells.
Hence, the correct answer is option 2.

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