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Which mixture is used for making glass?

  • A.Quartz and mica
  • B.Salt and quartz
  • C.Sand and salt
  • D.Sand and silicates

Answer: D

Glass is made from sand and silicates - silica fused with sodium carbonate and limestone.

The soda lowers silica's melting point from about 1,700°C to a workable temperature, and the lime stops the product dissolving in water. The mixture cools to a rigid but non-crystalline solid.

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