Question

write an equation for decomposition reactions where energy is supplied in the form of heat, light and electricity​

Answer 1

Answer :

(i) Decomposition in the presence of heat:-

• Decomposition of ferrous sulphate crystals is carried out by energy supplied in the form of heat.
• Reaction is as follows:-

$\rm{2FeSO_4(s)\xrightarrow{\text{heat}}Fe_2O_3(s)+SO_2(g)+SO_3(g)}$

(ii) Decomposition in the presence of light:-

• Decomposition of silver iodide to form silver and iodine is carried out by energy supplied in the form of light.
• Reaction is as follows:-

$\rm{2AgI(s)\xrightarrow{\text{light}}2Ag(s)+I_2(s)}$

(iii) Decomposition in the presence of electricity:-

• Decomposition of molten lead bromide to lead and bromine is carried out by energy supplied in the form of electricity.
• Reaction is as follows:-

$\rm{PbBr_2(l)\xrightarrow{\text{electricity}}Pb(s)+Br_2(l)}$

$\hrulefill$

★︎ Extra Information:-

Decomposition reaction:

• A reaction in which a single reactant is split or broken down into a number of simpler products (when supplied with energy in the form of heat, light or electricity).

• Example: burning of limestone.

Answer 2

Answer:

Decomposition reaction requiring heat is known as thermal decomposition , CaCO3--------->CaO + CO2. Decomposition reaction requiring light is known as photo chemical decomposition reaction , 2AgCl-------2Ag + Cl2.