ANSWER---

◆ The reaction in which single substance decomposes two or more substances is called 'DECOMPOSITION REACTION'.

◆ There are three type of decomposition
1. Thermal Decomposition
2. Electrolytic Decomposition
3. Sunlight Decomposition

● When the decomposition reaction carried by heat is called thermal decomposition.

Example = 2FeSO4 --heat--- FE2O3 + SO2 + SO3

● When the decomposition reaction carried by ELECTRIC current is called electrolytic decomposition.

Example = H2 --electric current-- 2H + O2

● When the decomposition reaction carried by sunlight is called sunlight decomposition.

Example 2AgCl --sunlight-- 2Ag + Cl2

◆ importance of decomposition reaction in Metal Industries

● Electrolytic is used in the extraction of metal from their naturally occurring compounds, generally chloride and Oxides.

● Thermal decomposition is used for the production of CaO (Calcium OXIDE). from carbonate which is a major constitute of cement.

● Molten NaCl is electrolytically decomposed to form sodium metal.

● Aluminium metal is obtained by electric decomposition of bauxite ore mixed with cryolite.


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