Question

Photochemistry is involved in:

• A. fading of colour of fabric in sunlight
• B. photography
• C. printing
• D. polymerisation

Answer 1

Answer: (A), (B), (C), (D)

The correct options are
A fading of colour of fabric in sunlight
B photography
C printing
D polymerisation

Photochemistry generally applies to chemical modifications induced by interaction of light (electromagnetic radiation) with matter. Therefore, light is always one of the reactants in a photochemical system.

Since fading of colour in sunlight is due to the break down of coloured copounds called dyes by Ultraviolet rays. it is a bleaching effect. It is photochemical process

Photography- is based on photochemical process. When a picture is taken, the silver salts in the photographic film absorb light and chemically change into metallic silver, which produces a dark image on the negative when the film is developed.

Printing-It is possible to polymerize liquid resins in a targeted way by directing the light so that it strikes only specific areas. This can be done with the help of a laser scanner or with a light source. In this process, small monomer molecules are joined together to create large connected polymer molecules. that results in printing.

Polymerization can be done by via free-radical formation. Free-radical polymerization is a method by which a polymer forms by the successive addition of free-radical building blocks.

Therefore all are involved in photochemistry.

Option A,B,C,D are correct