when a white compound "X" is placed under sunlight it turns grey. give the name of reaction and write the balance chemical equation

The reaction is Photochemical decomposition . The substance can be Silver chloride or also Silver bromide.

2AgCl (s) sunlight } 2Ag (s) + Cl2(g)

silver chloride(white) in the presence of sunlight gives silver metal (grey) + chlorine gas.

all the best ......... thumbs up please.......