Arrange the following permanent gases present in the atmosphere in ascending order : 1. Helium 2. Hydrogen 3. Neon 4. Xenon Select the answer using the code given below :
- A. 3, 1, 2, 4
- B. 3, 1, 4, 2
- C. 2, 4, 1, 3 ✓
- D. 2, 4, 3, 1
Correct Answer: C. 2, 4, 1, 3
Explanation
Although the actual atmospheric abundance order is Xenon < Hydrogen < Helium < Neon, the official UPSC answer key marks option C (2, 4, 1, 3) as the correct choice.
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