A) Helium
B) Neon
C) Argon
D) Krypton
Correct Answer: C
Solution :
| Gas | (Abundance in air by volume (ppm)) |
| Helium | 5.2 |
| Neon | 18.2 |
| Argon | 93.4 |
| Krypton | 1.1 |
| Xenon | 0.09 |
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