Chlorine leaks can be detected by?

The correct method for detecting chlorine leaks is using an ammonia solution with a Q-Tip. Chlorine reacts with ammonia to produce a white cloud of ammonium chloride, which is a visible indicator of the presence of chlorine gas. This reaction occurs because chlorine gas is a strong oxidizer and will react with ammonia, making it a practical way to confirm a leak.

The other methods listed are less effective or reliable for detecting chlorine leaks. For example, personal protective equipment like a self-contained breathing apparatus (SCBA) is designed for safety and protection against exposure, not for leak detection. Alcohol vapor is not a reliable indicator of chlorine presence, as it does not produce a recognizable reaction with chlorine. Using a mist of water may help to suppress chlorine vapors but does not provide a clear detection method like the ammonia solution does.