For manufacturing of glass, which among the following is used as a sou

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For manufacturing of glass, which among the following is used as a source of silica ?

Fine clay soil
Wood powder
Coconut shell
Sand
This question was previously asked in
UPSC NDA-1 – 2023
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Glass is primarily composed of silica (silicon dioxide, SiO₂). The main raw material used as a source of silica for glass manufacturing is sand, specifically high-purity silica sand (often called quartz sand). Other components like soda ash (sodium carbonate) and limestone (calcium carbonate) are added to lower the melting point and improve workability.
– Glass is mainly made of silica (SiO₂).
– The primary natural source of silica used in glass manufacturing is sand.
– High purity silica sand is preferred for glassmaking.
Fine clay soil contains silica, but it also contains many impurities (like alumina, iron oxides) that would affect the clarity and properties of the glass. Wood powder and coconut shells are organic materials and not sources of silica for glassmaking.

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