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Pyrex glass is obtained by fusing together......... 

(A) 60 to 80% Al2O3, 10 to 25% SiO2 and remaining amount of B2O3

(B) 60 to 80% B2O3, 10 to 25% Al2O3 and remaining amount of SiO2

(C) 60 to 80% SiO2, 10 to 25% B2O3 and remaining amount of Al2O3

(D) 60 to 80% SiO2, 10 to 25% Al2O3 and remaining amount of B2O3

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Correct answer is: (C) 60 to 80% SiO2, 10 to 25% B2O3 and remaining amount of Al2O3

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