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Q: Pick the odd one out.
  • A. Nitrogen
  • B. Oxygen
  • C. Iron
  • D. Fluorine
Correct Answer: Option C - Iron is a solid element while Nitrogen, Oxygen and Fluorine are gases. Hence option (c) is odd.
C. Iron is a solid element while Nitrogen, Oxygen and Fluorine are gases. Hence option (c) is odd.

Explanations:

Iron is a solid element while Nitrogen, Oxygen and Fluorine are gases. Hence option (c) is odd.