Q. The main constituents of pearl are

(A) Calcium oxide and ammonium chloride
(B) Ammonium sulphate and sodium carbonate
(C) Aragonite and conchiolin
(D) Calcium carbonate and magnesium carbonate

✅ Correct Answer: (D) Calcium carbonate and magnesium carbonate

Published by Deepak Sahoo ⭐ 11.23K Points at 02-Jun-2021 09:34 am in Science

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