GK
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Silica
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Sodium borate
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Sodium silicate
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Calcium silicate
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Detailed explanation-1: -The correct answer is Silica. Glass is made from silicon, which is the second most common element in Earth’s crust. The main constituent of glass is silicon dioxide (SiO 2). The most common form of silica used in glassmaking has always been sand.
Detailed explanation-2: -Silica is the main component of glass: nearly 70% of the mass. Quartz sands contain mainly silica. Silica is the vitrifying element (oxide forming the vitreous network) of glass. The melting point of silica is 1700°C.
Detailed explanation-3: -Due to its high physical and chemical resistance, silica glass is used in the manufacture of laboratory glassware such as crucibles, beakers, evaporators, annealing pans and combustion boats. It is also irreplaceable as a high-quality watch glass and a raw material for the production of heat-resistant ceramic tiles.
Detailed explanation-4: -Water glass, also called sodium silicate or soluble glass, a compound containing sodium oxide (Na2O) and silica (silicon dioxide, SiO2) that forms a glassy solid with the very useful property of being soluble in water.
Detailed explanation-5: -Rims. The rims lend form and character to your eyeglasses-they also provide function by holding the lenses in place. End pieces. Bridge. Hinges. Lenses. Screws. Nose pads. Pad arms. More items •29-Nov-2017