Decomposition reactions require energy either in the form of heat or light or electricity for breaking down the reactants write one equation each for decomposition reaction where energy is supplied in the form of heat light and electricity.

 

Answer

 

The following are the reactions involving energy in the form of heat or light or electricity for breaking down the reactants in Decomposition reactions:

 

Heat - Decomposition of Calcium Carbonate (CaCO 3

On heating of Calcium Carbonate (limestone),

It decomposes into Calcium Oxide (Quick Lime) + Carbon Dioxide

 

CaCO 3 (s)         →          CaO(s) + CO 2 (g) 

                                            (Limestone)    Heat       (Quick lime)

 

Light - Silver Chloride turns grey in sunlight

It is because, the heat of sunlight decomposes silver chloride into silver and chlorine

 

2AgCl(s)      →      2Ag(s) + Cl 2 (g)

                                                                                 Sunlight 

 

Electricity - Electrolysis of water

The breaking down of H 2 O into H 2 and O 2 by passing electricity is known as electrolysis of water.

2H 2 O        →          2H 2 + O 2

                                                                    Electricity   

 

  1. Class 10
  2. Chapter 1 Class 10 - Chemical Reactions and Equations (Term 1)

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CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 11 years and a teacher from the past 11 years. He teaches Science, Accounts and English at Teachoo