Question

The element silicon is present in _________.
1. Sand
2. Limestone
3. Salt
4. Clay
5. None of the above

Answer 1

Correct Answer - Option 1 : Sand

The correct answer is Sand.

• The element silicon is present in Sand.

• 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.