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what is the chief constituent of py...

what is the chief constituent of pyrex glass ?

A

60 to 80 % `Al_(2)O_(3)` 10 to 25% `SiO_(2)` and remaining amount of `B_(2) O_(3)`

B

60 to 80% `B_(2) O_(3)` , 10 to 25% `Al_(2) O_(3)` and remaining amount of `SiO_(2) `

C

60 to 80 % `SiO_(2)` , 10 to 25% `B_(2) O_(3) ` and remaining amount of `Al_(2) O_(3) `

D

60 to 80 % `SiO_(2)` , 10 to 25 % `Al_(2) O_3` and remaining amount of ` B_(2)O_(3) `

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The correct Answer is:
C
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