Decomposition reaction- define.

Reactions in which a single compound is broken down into multiple products by the action of a catalyst. if the catalyst is heat the it is thermal decomposition Pb(NO3)2------>PbO+NO2+O2 FeSO4.5H2O------>Fe2O3+SO2+SO3 burning smell of sulphur. if the catalyst is light then it is calle photolystic decomposition. 2AgCl------>2Ag+Cl2. 2AgBr------>2Ag+Br2. these are used in black and white photography. the cl and br turn into gas leaving behind grey Ag. the br is reddish brown. agbr is pale yellow when the catalyst is electricity. it is known as electrolytic decompostion 2H2O-------2H2+O2 h2 is produced in the cathode and oxygen in the anode. twice the volume of oxygen is produced. are generally endothermic in nature