Which of the following statements is true about the input of energy in decomposition reactions?

The correct statement regarding the input of energy in decomposition reactions is that most require an input of energy in the form of heat, light, or electricity. Decomposition reactions involve breaking down a compound into simpler substances, which often requires overcoming the energy barrier associated with breaking the chemical bonds within the compound. As a result, input energy is generally necessary to facilitate this process.

In many cases, heat can provide the energy needed to initiate the reaction by increasing the kinetic energy of the molecules, while light or electricity can also supply the necessary energy depending on the specific decomposition reaction. This feature distinguishes decomposition reactions from some other types of chemical reactions that may occur spontaneously without an external energy source.

Recognizing that not all decomposition reactions operate under the same conditions reinforces the understanding that various external energy sources can be pivotal in driving these reactions.