Which gas is characterized by a brownish or reddish color and has a specific gravity of 2.263?

The gas characterized by a brownish or reddish color and a specific gravity of 2.263 is indeed related to the oxides of nitrogen, specifically nitrogen dioxide (NO2). Nitrogen dioxide is known for its distinctive reddish-brown color and is a significant air pollutant with implications for both health and the environment. Its specific gravity indicates that it is heavier than air, which is relevant in ventilation and safety practices, particularly in confined spaces where this gas could accumulate and pose a risk.

Understanding the properties of this gas is crucial for those working in mining and related industries, as exposure can lead to respiratory issues and other health concerns. Proper ventilation systems are essential to mitigate the dangers associated with the accumulation of nitrogen dioxide or other hazardous gases, emphasizing the importance of recognizing their characteristics in safety protocols.

In contrast, other gases listed do not share the same color and gravity characteristics. Carbon monoxide is colorless and odorless; chlorine is yellowish-green and also significantly different in specific gravity; ozone is typically described as a pale blue gas with a distinct smell and a different specific gravity. This differentiation is fundamental to ensuring the safety and health of workers in environments where various gases may be present.