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Question
Which of the following statements are true about quartz?
A. it is pure crystalline form of silica.
B. it is a tetrahedral polymer of SiO2.
C. UV light can pass through quartz.
Which of the following statements are true about quartz?
A. it is pure crystalline form of silica.
B. it is a tetrahedral polymer of SiO2.
C. UV light can pass through quartz.
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Solution
The correct option is A A and C are correct
Various forms of silica (SiO2) are quartz, sand, flint etc.
It is made up of a continuous framework of SiO4 silicon-oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall formula SiO2.
Quartz is a good transmitter of UV rays. Most glasses are opaque to UV. The UV range is from 0.1 nm to about 400 nm (or from 100 Ao to about 4000 Ao). The visible light wavelengths are longer, between 400 nm and 700 nm. Quartz will transmit UV from 180 nm to 400 nm. Since quartz is made of silicon dioxide, glasses made from a high proportion of this material will also readily transmit UV. One such glass is known as VYCOR, which is 96% silica.
So statement A and C are correct.
Various forms of silica (SiO2) are quartz, sand, flint etc.
It is made up of a continuous framework of SiO4 silicon-oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall formula SiO2.
Quartz is a good transmitter of UV rays. Most glasses are opaque to UV. The UV range is from 0.1 nm to about 400 nm (or from 100 Ao to about 4000 Ao). The visible light wavelengths are longer, between 400 nm and 700 nm. Quartz will transmit UV from 180 nm to 400 nm. Since quartz is made of silicon dioxide, glasses made from a high proportion of this material will also readily transmit UV. One such glass is known as VYCOR, which is 96% silica.
So statement A and C are correct.
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