NO2 fumes is . . . . . . . . in colour. A. brown B. yellow C. light yellow D. red

The correct answer is: A. brown

Nitric oxide (NO2) is a reddish-brown gas at room temperature. It is a major component of smog and is a toxic air pollutant. NO2 is formed when nitrogen dioxide reacts with oxygen in the air. It is also produced by combustion of fossil fuels, such as coal and oil.

NO2 is a very reactive gas and can react with many other substances, including water, to form nitric acid. Nitric acid is a strong acid that can corrode metals and other materials. It can also cause respiratory problems in humans.

NO2 is a greenhouse gas and contributes to climate change. It is also a precursor to ozone, which is a harmful gas

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