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Answer :
Final answer:
Ordinary glass is composed primarily of sand (silica), sodium carbonate, and limestone, making up over 75% of the glass material. Option 4
Explanation:
The main ingredients of ordinary glass are sand (silica), sodium carbonate, and limestone. Specifically, typical glass consists of silica (SiO₂) which makes up about 70 to 74% of its weight, sodium oxide (Na₂O) which comes from sodium carbonate (Na₂CO3), and calcium oxide (CaO), also known as lime.
These components, along with minor additives such as magnesia (MgO) and alumina (Al2O3), account for over 75% of manufactured glass. Therefore, the correct option from the choices provided is sand, sodium carbonate, limestone. Option 4
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