Question

Classify the following reaction as:

$2\mathrm{AgBr}\stackrel{\mathrm{Sunlight}}{\to }2\mathrm{Ag}+{\mathrm{Br}}_2$

(i) Chemical combination or synthesis.

(ii) Chemical decomposition reaction.

(iii) Double decomposition reaction.

(iv) Displacement or substitution reaction.

(v) Neutralization reaction.

(vi) Reversible reaction.

(vii) Photochemical reaction.

(viii) Isomerisation or rearrangement reaction.

Answer 1

Photochemical reaction:

• The reaction that occurs in the presence of light, is called a photochemical reaction.
• A photochemical reaction is a chemical reaction triggered when light energy is absorbed by molecules.

For example:

$2\mathrm{AgBr}\stackrel{\mathrm{Sunlight}}{\to }2\mathrm{Ag}+{\mathrm{Br}}_2$