Which one among the following statements for the gases mentioned below is not correct?
- A. Hydrogen has 3 isotopes.
- B. Helium is a commonly used gas in electric bulbs. ✓
- C. Oxygen is used to burn fuel in rocket engines in spacecraft.
- D. Nitrogen can be used in gaseous form to replace air in food packaging.
Correct Answer: B. Helium is a commonly used gas in electric bulbs.
Explanation
Argon or Nitrogen, not Helium, is commonly used in electric bulbs to prevent the filament from oxidizing[cite: 1].
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