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Q94 (CDS-II/2025) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Basic chemical principles Answer Verified

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:

Result
Your answer: —  Â·  Correct: C
Explanation
According to NCERT Class 11 Geography (Table 8.1), the concentration of these permanent gases by volume is: Hydrogen (0.00005%), Xenon (0.00009%), Helium (0.0005%), and Neon (0.002%). Arranging them in ascending order (lowest concentration to highest) gives the sequence: Hydrogen (2) < Xenon (4) < Helium (1) < Neon (3). This sequence (2, 4, 1, 3) matches Option C. The currently marked answer (D) is incorrect because it mistakenly places Neon (0.002%) before Helium (0.0005%) in an ascending series.
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