General Knowledge - General Science - Discussion

58. 

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

Answer: Option B

Explanation:

No answer description available for this question.

Praveen said: (Nov 27, 2011)  
Pearls are hard..and white..and made by an insect(forgot name) which release Calcium carbonate

Pruthi said: (Mar 6, 2012)  
Natural pearls are nearly 100% calcium carbonate and conchiolin.

Daniel said: (Apr 20, 2012)  
Pearls are whitish substance of magnesium carbonate and magnesium carbonate.

K.M.Jayakarkuvel Raj said: (Sep 8, 2012)  
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.

Apr said: (Jul 9, 2014)  
PEARL HARBOUR incident lead to HIROSHIMA and NAGASAKI mahakanda in JAPAN gave up in WW2.

Anyways coming back to chemistry from history we have.

Following chief constituents of pearl:

1. Calcium Carbonate.

2. Calcium Oxide.

3. Ammonium Sulphate.

4. Ammonium Chloride.

5. Magnesium Carbonate.

6. Sodium Chloride.

7. Aragonite.

8. Conchiolin.

As per question and the answer option combination the "main components" So answer should be CALCIUM CARBONATE & MAGNESIUM CARBONATE.

Shristi said: (Apr 7, 2015)  
Pearls are not a single compound, but a mixture of calcium carbonate with a protein called conchiolin, which acts as a sort of "binder".

Ankit said: (Apr 11, 2015)  
Pearl are made of calcium carbonate and magnesium carbonate.

Satish Kumar Chandrakar said: (Jun 14, 2015)  
Pearl is formed by the combination of aragonite 85%+alubiminaid protein (conchiolin)12%+water 3%.

So please correct the answer which is option C and not B.

Bala said: (Aug 14, 2016)  
What is said by @K.M.Jayakarkuvel Raj is right I think so.

Avinash said: (Apr 22, 2017)  
The main constituents are not having a magnitude that's towards occupied by calcium carbonate and magnesium carbonate.

Priyanka said: (Sep 18, 2017)  
I am not understanding what is conchiolin. Please, can anyone tell me?

Anu said: (Oct 26, 2017)  
Pearl is obtained from mollusca Pinctada vulgaris.

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