Question:
The inert gas found most abundant in the atmosphere is
The inert gas found most abundant in the atmosphere is
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Argon is the third most abundant gas after N$_2$ and O$_2$.
Updated On: May 1, 2026
- He
- Ne
- Ar
- Kr
- Xe
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The Correct Option is C
Solution and Explanation
Concept:
Noble gases are chemically inert and present in trace amounts in the atmosphere. Among them, argon is the most abundant due to radioactive decay processes.
Step 1: Atmospheric composition.
• Nitrogen = 78%
• Oxygen = 21%
• Argon = 0.93%
Step 2: Origin of argon.
Argon-40 is produced from radioactive decay of potassium-40 in Earth's crust, increasing its abundance.
Step 3: Comparison with other noble gases.
• He, Ne → escape due to low mass
• Kr, Xe → very rare
Step 4: Why other options are incorrect.
• (A), (B): lighter gases escape atmosphere
• (D), (E): present in trace ppm levels Final Conclusion:
Argon is the most abundant noble gas in atmosphere.
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