Showing posts with label The main constituents of pearls are PAGE 71. Show all posts

Showing posts with label The main constituents of pearls are PAGE 71. Show all posts

Wednesday, 2 December 2015

The main constituents of pearls are

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GENERAL KNOWLEDGE









71. The main constituents of pearls are

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

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