The chemical reaction : 2AgCl (s)->2Ag (s)+Cl2(g) takes place

The chemical reaction 2AgCl (s) → 2Ag (s) + Cl₂ (g) represents the photolytic decomposition of silver chloride. This reaction occurs specifically in sunlight.

• Process: When white silver chloride is exposed to sunlight, it absorbs light energy, which provides the necessary activation energy to break the chemical bonds, decomposing it into grey-colored silver metal and chlorine gas.
• Visual Change: The white silver chloride turns grey in sunlight due to the formation of silver metal.
• Historical Application: This reaction, along with the similar decomposition of silver bromide (AgBr), was fundamentally used in black and white photography.
• Storage: Because of this high sensitivity to light, silver chloride is typically stored in dark-colored bottles to prevent unintended decomposition. This is a standard concept covered in NCERT Class 10 Science (Chapter: Chemical Reactions and Equations).