Which of the following is known as the "Laughing gas" :

Options :
  1. Magnesium Oxide
  2. Nitrous Oxide
  3. Nitrogen Oxide
  4. Zinc Oxide
Answer and Explanation :-

Answer: Option 2

Explanation:

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Books! tis a dull and endless strife:Come, hear the woodland linnet,How sweet his music! on my life,There's more of wisdom in it.
-William Wordsworth Wordsworth: Poems