When silver chloride is exposed to light, its colour changes from white to grey. This is an example of which type of decomposition reaction?
Answer and explanation
Correct answer: Photolytic decomposition
In the presence of light, silver chloride decomposes to form metallic silver and chlorine gas: \(2AgCl \xrightarrow{sunlight} 2Ag + Cl_2\). The metallic silver formed causes the grey colour. Since light causes the decomposition, it is photolytic decomposition. In contrast, thermal decomposition is caused by heat, while electrolytic decomposition is caused by electric current.
Frequently asked questions
What is the correct answer to this question?
Photolytic decomposition
Why is this the correct answer?
In the presence of light, silver chloride decomposes to form metallic silver and chlorine gas: \(2AgCl \xrightarrow{sunlight} 2Ag + Cl_2\). The metallic silver formed causes the grey colour. Since light causes the decomposition, it is photolytic decomposition. In contrast, thermal decomposition is caused by heat, while electrolytic decomposition is caused by electric current.
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.
