Question

Which of the following is a thermal decomposition reaction ?
(a) 2H2O → 2H2 + O2
(b) 2AgCl → 2Ag + Cl2
(c) ZnCO3 → ZnO + CO2
(d) H2(g) + Cl2(g) → 2HCl(g)

Answer 1

Answer:

c) is a thermal decomposition reaction

Answer 2

(c) $ZnCO_{3}$  →   $ZnO + CO_{2}$  

What is a thermal decomposition reaction?

• A thermal decomposition reaction can be defined as a decomposition reaction which is activated by thermal energy (Heat) .
• In other words, a thermal decomposition reaction requires energy to react in the form of heat.
• Thermal decomposition reactions are generally endothermic in nature since it requires energy to break the chemical bonds and separate the constituent elements.
• An example of a thermal decomposition reaction is provided below -

                     $ZnCO_{3}$  →  $ZnO + CO_{2}$