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Which of the following is NOT a noble gas?
1. Krypton 
2. Argon 
3. Xenon 
4. Chlorine 

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Correct Answer - Option 4 : Chlorine 

The correct answer is Chlorine. 

  • Noble gases are those gases that do not react with any other element and are stable to exist on their own.
  • Chlorine is a yellow-green gas at room temperature.
  • It is an extremely reactive element and a strongly oxidising agent
  • There are a total of 6 noble gases found on the extreme right column of the periodic table.

These noble gases are:

  1. Radon,
  2. Argon,
  3. Xenon,
  4. Krypton,
  5. Helium,
  6. Neon.

  • Oxygen is not a noble gas 

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