Chlorine can easily be detected and identified using a chemical test called the silver nitrate test. This test is based on the fact that chlorine gas reacts with silver nitrate solution to form a white precipitate of silver chloride. The following chemical equation represents the reaction between chlorine and silver nitrate:

Cl₂(g) + 2AgNO₃(aq) → 2AgCl(s) + 2NO₂(g)

In this equation, Cl₂ represents Chlorine, AgNO₃ represents Silver nitrate, AgCl represents Silver chloride precipitate which is insoluble and forms as a suspension, and NO₂ represents Nitrogen Dioxide.

To perform the silver nitrate test, a small amount of the gas sample to be tested is bubbled through a solution of silver nitrate. If chlorine is present, the solution will quickly turn cloudy due to the formation of the silver chloride precipitate.

The silver nitrate test is a simple and effective way to confirm the presence of chlorine gas. It is widely used in laboratories, industries, and even for water testing to ensure safety and prevent harm caused by chlorine exposure.