Question

Which of the following is decomposed by sunlight? (1)

CuCl2 (NH4)2 CO3 AgBr NaCl​

Answer 1

Answer:

AgCl is decomposed by the action of light.

Answer 2

AgBr is decomposed by sunlight.

Explanation:

• Silver bromide is photosensitive chemical.
• Silver bromide is water insoluble salt known for its unusual sensitivity to light and this property has allowed silver halides to become the basis of modern photographic materials.
• In the presence of light decomposition of silver bromide gives silver which turns grey on exposure to light.

• A decomposition reaction is a reaction in which a compound breaks down into two or more simpler substances.

• Reaction can be given as:

AB -> A+B

• Yellow colored Silver bromide turns to grey by absorbing photo electrons from rays of sun.

• Decomposition reaction is useful in photography.

• It is a photolytic decomposition reaction:

$2AgBr (s)+sunlight$→$2Ag(s)+Br_{2}(g)$