What color is chlorine gas?

Chlorine gas is identified as having a greenish-yellow color. This distinctive color is important in various fields, especially when it comes to safety and handling procedures for chlorine, which is a common disinfectant used in water treatment. The visibility of its color helps workers recognize the presence of chlorine gas in the air, which is crucial as it can be toxic and harmful if inhaled in significant amounts.

The other color options are not characteristic of chlorine gas. For instance, clear would imply it is colorless, which does not describe chlorine accurately. Blue is associated with other substances but not with chlorine. White might refer to chlorine in its solid form or as a liquid but is not representative of the gas itself. Thus, the recognition of chlorine as a greenish-yellow gas is vital for safety protocols and effective communication in environments where it is used.