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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I remembered back to leo's burial and holding your hand. I was eleven and you were six, your hand soft and small in mine. As the vicar said 'in sure and certain hope of the resurrection of eternal life' you turned to me, 'I don't want sure and certain hope I want sure and certain Bee.
-Rosamund Lupton Sister