Which glass has the highest percentage of lead?

Soda glass

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Flint glass

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Jena glass

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Pyrex glass

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Solution

The correct option is B Flint glass
Flint glass or lead glass has composition of $K_{2} O \cdot P b O \cdot 6 S i O_{2}$ . It is used in making electric bulb and optical instruments. Flint glass has relatively high refractive index. Flint glass contains approx $4 - 60$ % $P b O$ .

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