Question

balance chemical equation for the following Silver Bromide on exposure to sunlight decomposes into silver and bromine

Answer 1

the balance chemical equation is as follows
2AgBr⇒ 2Ag + Br2

Answer 2

Silver Bromide is exposed to light, it decomposes to silver metal and bromine vapours.
2AgBr (s) -------------------> 2Ag (s) + Br2 (g).
In this reactions, pale yellow colour of silver bromide changes to greyish white due to formation of silver metal.
The decomposition is due to sunlight or light bulb.
This reaction reaction of silver bromide is also used in black and white photography.