B.A./B.COM. LL.B. (5 YEAR LAW / U.G. LAW) Panjab University Entrance Exam 2016 : MCQs and Answer Key

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56.

The Main Constituent Of Pearls Are :

A: Calcium Oxide And Aragenite
B: Calcium Carbonate And Magnesium Carbonate
C: Amonium Chloride And Conchiolin
D: Amonium Sulphate And Sodium Carbonate

The answer is: B

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Explanation

Pearls are composed of calcium carbonate (mainly aragonite or a mixture of aragonite and calcite) in minute crystalline form, which has deposited in concentric layers. Therefore, option B is correct.