Among the following chemicals which one is not a compound?

Options :
  1. Silica
  2. Red lead
  3. Slaked lime
  4. Black lead
Answer and Explanation :-

Answer: Option 4

Explanation:

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We have become, by the power of a glorious evolutionary accident called intelligence, the stewards of life's continuity on earth. We did not ask for this role, but we cannot abjure it. We may not be suited to it, but here we are.
-Stephen Jay Gould The Flamingo's Smile: Reflections in Natural History