everyday science MCQ #3776

Which of the following is the lightest gas?

everyday science MCQ #3776

  1. Question 1

    Q1. Which of the following is the lightest gas?

    • A) Nitrogen
    • B) Hydrogen
    • C) Ammonia
    • D) Carbon dioxide

    Answer: Hydrogen

    Explanation: Hydrogen is the lightest of all gases, with a molecular mass of only 2 g/mol, far lighter than nitrogen (28), ammonia (17), or carbon dioxide (44).