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Which gases are considered the most common inert gases?

  1. Oxygen, Nitrogen, Helium, Carbon Dioxide

  2. Air, Nitrogen, Argon, Carbon Dioxide

  3. Carbon Dioxide, Argon, Oxygen, Nitrogen

  4. Hydrogen, Oxygen, Nitrogen, Air

The correct answer is: Air, Nitrogen, Argon, Carbon Dioxide

The most common inert gases typically refer to noble gases, which are found in the far-right column of the periodic table and are characterized by their lack of reactivity due to having full valence electron shells. In this context, the choice identifying a mixture that contains Nitrogen and Argon is significant because Nitrogen constitutes a major component of air and is often considered inert in many applications due to its relatively low reactivity. Argon is another gas that is classified as inert, widely used in various industrial processes due to its non-reactive nature. Including Carbon Dioxide on this list might be misleading; while it is a common gas, it is not classified as an inert gas, as it participates in chemical reactions and is involved in processes such as respiration and photosynthesis. Similarly, while the other options may include mixtures of gases, the presence of Nitrogen and Argon in the correct choice aligns best with common understandings of inert gases and their usage in various applications where reactivity needs to be minimized.