Question

Write one equation each for decomposition reactions where energy is supplied in the form of heat, light or electricity.


NCERT Class 10th Science Chapter 1 Chemical Reactions and Equations

Answer 1

heat.......
caco3--heat->cao +co2
light.....
2agcl-----sunlight--->2ag +cl2
electricity/.........
2h20--------electicity------> 2h2 +o2

Answer 2

Answer: $CaCO_3\rightarrow CaO+CO_2$

Light: $2AgCl(s)\rightarrow 2Ag(s)+Cl_2(g)$

Electricity: $2H_2O\rightarrow 2H_2+O_2$

Explanation:

Decomposition reaction is a chemical reaction in which one reactant is converted to two or more than two products. The breaking of bonds require absorption of energy and thus all decomposition reactions are endothermic in nature.

Thermal decomposition is decomposition carried by using heat, Photo decomposition is decomposition carried by using light and Electrolytic decomposition is decomposition carried by using electricity.