"Forgiveness is a virtue of the brave."
- Indira Gandhi
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
Option Answer: D
No answer description available for this question.
(Sun, Nov 27, 2011 08:10:12 AM)
Pearls are hard..and white..and made by an insect(forgot name) which release Calcium carbonate
(Tue, Mar 6, 2012 02:59:12 PM)
Natural pearls are nearly 100% calcium carbonate and conchiolin.
(Fri, Apr 20, 2012 05:00:42 PM)
Pearls are whitish substance of magnesium carbonate and magnesium carbonate.
K.M.Jayakarkuvel Raj said:
(Sat, Sep 8, 2012 04:36:20 AM)
A pearl is a hard object produced within the soft tissue (specifically the mantle) of a living shelled mollusk. Just like the shell of a mollusk, a pearl is made up of calcium carbonate in minute crystalline form, which has been deposited in concentric layers.
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