Which of the following is the heaviest gas under standard conditions?

Practice MCQ for SSC, UPSC, RRB Exams

A. Oxygen (O₂) A.
B. Xenon (Xe) B.
C. Carbon dioxide (CO₂) C.
D. Radon (Rn) D.

Correct Answer: D সঠিক উত্তর: D

Explanation ব্যাখ্যা

Radon is the heaviest noble gas and the densest naturally occurring gas at room temperature. It is radioactive and has a higher atomic mass than other gases listed.

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