A pale blue gas with a fish like odour restores the colour of a blackened lead painting. The gas is also used as rocket fuel. It is

Options :
  1. oxygen
  2. ammonia
  3. sulphur dioxide
  4. ozone
Answer and Explanation :-

Answer: Option 2

Explanation:

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Then he realized: 'I, indeed, am this creation for I have poured it forth from myself.' In that way he became this creation. And verily, he who knows this becomes in this creation a creator.
-Brihadaranyaka Upanishad