The following diagram displayes a chemical reaction. Observe carefully and answer the following questions :

(i) Identify the type of chemical reaction that will take place and define it . How will the colour of the salt change ?
(ii) Write the chemical equation of the reaction that takes place.
(iii) Mention one commercial use of this salt

Explanation

(i) Photochemical decomposition : A single reactant breaks down to give simpler products.
White silver chloride changes to grey, as it decomposes to silver and chlorine in presence in presence of sunlight .
(ii) `2AgCl(S) overset("Sunlight")rarr2Ag(S)+Cl_(2)(g)`
(iii) Black and write photopgraphy.