Why are photosensitive silver salts such as silver chloride kept in the dark?
Answer and explanation
Correct answer: To prevent decomposition caused by light
Silver chloride is photosensitive. On exposure to light, it undergoes photochemical decomposition to form metallic silver and chlorine: \(2\mathrm{AgCl}\xrightarrow{\text{light}}2\mathrm{Ag}+\mathrm{Cl_2}\). Therefore, it is kept in the dark. Option D is different because light, not heat, is the main cause of decomposition here.
Frequently asked questions
What is the correct answer to this question?
To prevent decomposition caused by light
Why is this the correct answer?
Silver chloride is photosensitive. On exposure to light, it undergoes photochemical decomposition to form metallic silver and chlorine: \(2\mathrm{AgCl}\xrightarrow{\text{light}}2\mathrm{Ag}+\mathrm{Cl_2}\). Therefore, it is kept in the dark. Option D is different because light, not heat, is the main cause of decomposition here.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.
