Question

The chemical reactions which proceed with the absorption of light energy are called _____reactions

Answer 1

Photochemical reactions

1. A photochemical reaction is a chemical reaction initiated by the absorption of energy in the form of light, photons which result in certain products.
2. This reaction is based on the principles of photochemistry, when light shines on a molecule it goes to an excited state process known as photoexcitation.
3. Example: Photography uses the action of light on grains of Silver bromide ($\mathrm{AgBr}$) or silver chloride $\mathrm{AgCl}$ to produce an image.
4. Reaction involved: $\underset{\mathrm{Silver}\mathrm{Chloride}}{2\mathrm{Agcl}\left(\mathrm{s}\right)}+hv\to \underset{\mathrm{Silver}}{2\mathrm{Ag}\left(\mathrm{s}\right)}+\underset{\mathrm{Chloride}}{{\mathrm{Cl}}_2\left(\mathrm{g}\right)}$

Therefore, The chemical reactions which proceed with the absorption of light energy are called Photochemical reactions.