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The name 'silica' covers an entire group...

The name 'silica' covers an entire group of minerals which have the general formula `SiO_2` , most common of which is quartz. quartz is a frame work silicate with `SiO_4` tetrahedra arranged in spirals . The spirals can turn in a clockwise or anti-clockwise direction - a feature that results in these being two mirror images optically active, varieties of quartz.
`Si_3O_9^(6-)` (having three tetrahedra ) is represented as :

A

B

C

Both

D

None.

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The correct Answer is:
B
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Read name silica covers an entire group of minereal, which have the general formual SiO_(2) , the mole common of which is quartz. Quartz is form work silicane with SiO_(4) tetrahedra arranged in spirals. The spirals can turn in a clockwise or anticlockwise direction a feature that results in there being two mirror images, optically active, varieties of quartz. Si_(3)O_(9)^(6-) (having three tetrahedral) is represented as

Read name silica covers an entire group of minereal, which have the general formual SiO_(2) , the mole common of which is quartz. Quartz is form work silicane with SiO_(4) tetrahedra arranged in spirals. The spirals can turn in a clockwise or anticlockwise direction a feature that results in there being two mirror images, optically active, varieties of quartz. The following pictures represent various silcate anions. Their formulae are respectively.

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