Showing posts with label The main constituents of pearls are PAGE 64. Show all posts

Showing posts with label The main constituents of pearls are PAGE 64. Show all posts

Tuesday, 1 December 2015

The main constituents of pearls are

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64. 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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