Which gas appears colorless but turns brown upon exposure to air due to formation of NO₂?

Practice MCQ for SSC, UPSC, RRB Exams

A. Nitric oxide A.
B. Nitrogen B.
C. Oxygen C.
D. Carbon dioxide D.

Correct Answer: A সঠিক উত্তর: A

Explanation ব্যাখ্যা

Nitric oxide (NO) is colorless but reacts with oxygen to form brown NO₂.

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