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The element silicon is present in ________.
1. Sand
2. Limestone
3. Salt
4. Clay

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Correct Answer - Option 1 : Sand

The correct answer is Sand.

  • The element silicon is present in Sand.
  • Silicon is the second most abundant electropositive element which makes up 27.7% of the Earth's crust by mass. 
  • About 97% of Earth's crust is made of rocks and comprises silicon and oxygen compounds

  • Silicon is obtained from sand and is a poor conductor of electricity.
  • But, by chemical processes, it becomes a good conductor.
  • The surface and the interior of a silicon ‘chip’ are called Integrated Circuits (IC).
  • Silicon is used to make alloys like aluminium-silicon and ferrosilicon (iron-silicon).
  • Silicon:
    • Symbol: Si
    • Atomic number: 14
    • Atomic mass: 28 u

  • Limestone is a sedimentary rock.
    • In India, it is found in  Rajasthan, Madhya Pradesh, Andhra Pradesh, Gujarat, Chhattisgarh.

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