Question

write the name of a product formed during thermal
decomposition which is used by plants for preparing
their food ?​

Answer 1

That is called as Pyrolysis.

Thats all.

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Answer 2

Answer:

Thermal decomposition of calcium carbonate( CaCO3) leads to the production of calcium oxide( CaO) and carbon-dioxide( CO2)  

CaCO3 ----> CaO + CO2

Carbon dioxide is taken by the plants for the process of photosynthesis. It uses carbon dioxide and water as reactants to form glucose and oxygen. The reaction is given below:

6CO2 + 6H2O ------> C6H12O6 + 6O2

Thermal decomposition is the process of breakdown of a compound into its components in the presence of heat.