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Which one of the following statements about glass is not correct?

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Which one of the following statements about glass is not correct?

(a) Glass is often said to be a supercooled liquid.

(b) Glass has no definite melting point

(c) Soda glass is harder than pyrex glass.

(d) Boron is present in pyrex glass.

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(c) Soda glass is harder than pyrex glass.

Soda glass is composed of SiO4 unit. It is also called as soda lime silica glass.

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