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Q61 (NDA-II/2024) Science & Technology › Basic Science (Physics, Chemistry, Biology) Official Key

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

Explanation

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).
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