The composition of mica is :...

The composition of mica is :

A

`NaAlSiO_4. 3H_2O`

B

`K_2O.3 Al_2O_3. 6SiO_2. 2H_2O`

C

`K_2HAl(SiO_4)_3`

D

`NaK. SiO_4. 10H_2O`

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The correct Answer is:

B

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