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The Borosilicate glass does not contain ________

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The Borosilicate glass does not contain ________

(a) SiO2

(b) B2O3

(c) Al2O3

(d) KH2PO4

I got this question by my school teacher while I was bunking the class.

This intriguing question comes from Types of Bioreactors topic in section Recovery and Purification of Fermentation Products, Effluent Treatment, Bioreactor Design Considerations of Fermentation Technology

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Best answer
The correct option is (d) KH2PO4

The best explanation: Borosilicate glass is chemically inert, easy to clean and robust. The glass is made up of SiO2 81 %, B2O3 13 % ,NaO2 + K2O 4 % and Al2O3 2 %. It has to meet the criteria for the thickness of the glass, the number of air bubbles within the glass and the number of bubbles on the surface.

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