Question

Which of the following statements is not correct for a noble gas?

• A. Argon is used to fill the incandescent bulbs
• B. Krypton is obtained in nuclear fission.
• C. Radon is present in the atmosphere
• D. Xenon cannot form $Xe{F}_3$

Answer 1

The correct option is C Radon is present in the atmosphere

• Argon is used to fill incandescent light bulbs to inhibit the evaporation of the tungsten filaments and increase the bulb's life.
  

• The major source of krypton-$85$ is nuclear fission, with a fission yield of about $0.3\%$ krypton.
  

• Radon is a radioactive element and is not found in the atmosphere. It is found in rocks containing uranium ores and is produced by the radioactive decay of radium.
  

• Xenon can combine only with an even number of fluorine atoms and not an odd number of fluorine atoms. In other words, it cannot form compounds like $Xe{F}_3$ and $Xe{F}_5$, but it can form compounds like $Xe{F}_2$, $Xe{F}_4$ and $Xe{F}_6$.
  

Thus, the statement (C) is incorrect for a noble gas.