Multiple choice general knowledge science & technology

Quartz crystals normally used in quartz clocks etc. is chemically

  1. silicon dioxide

  2. germanium oxide

  3. a mixture of germanium oxide and silicon dioxide

  4. sodium silicate
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A Correct answer
Explanation

Quartz is crystalline silicon dioxide (SiO2), the most abundant mineral in Earth's crust. It is piezoelectric, making it ideal for oscillating in quartz clocks. Germanium oxide and sodium silicate are chemically different substances.

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