Question

Name the compound used in black and white photography. State whether the reaction that occurs is exothermic or endothermic. Give justification for your answer.

Answer 1

Photography in black and white uses silver chloride. It is an endothermic process. Photodecomposition is the process by which silver chloride breaks down into silver and chlorine after absorbing sunlight.

\[\ce{2AgCl ->[Sunlight] 2Ag + Cl2}\]