1.

Name the salts that are used in black and white photography. Give reactions when they are exposed to light. Define the type of chemical reaction taking place.

Answer»

Silver chloride (Agcl) and Silver bromide (AgBr)

2AgCl+ Sunlight   2Ag+Cl2

2AgBr +Sunlight  2Ag+Br2 

Those reactions in which energy is absorbed (in form of heat, light or electricity) to break down the reactants is called decomposition reaction. 



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