1.

Pyrexglassis obainedbyfusingtogether_____.

Answer»

60 to 80%`Al_(2)O_(3)` 10to25%`SiO_(2)` andramininf amountof `B_(2)O_(3)`
60to 80%`B_(2)O_(3)`, 10to 25%`Al_(2) O_(3) and` remainingamountof `SIO_(2)`
60to80 %`SiO_(2), 10` to`25%B_(2)O_(3) ` andremainingamountof `Al_(2) O_(3) `
60to 80%`SiO_(2), 10"to "25% Al_(2) O_3` andreamingamountof ` B_(2)O_(3) `

Answer :C


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