Question

How does the colour change occurs when AgCl is exposed to sunlight.
Pls answer.

Answer 1

Hi friend, Here is the required answer :-

When Silver Chloride is exposed to sunlight, a photochemical decomposition reaction takes place. Silver Chloride decomposes into Silver and Chlorine. That's why the colour change occurs.

AgCl ------------ Ag + Cl2

The colour changes from silver to grey.

Hope this helps you...

Answer 2

Photochemical Decomposition of AgCl takes place :
2AgCl ---> 2 Ag + Cl2
Thus the color changes from Gray to Silver.
This reaction is particularly useful in black and white photography.