Final answer:
The reaction 2 AgBr + light → 2 Ag + Br₂ involves redox and decomposition reaction types. It is photochemical and typically considered endergonic as energy in the form of light is absorbed.
Step-by-step explanation:
The reaction 2 AgBr + light → 2 Ag + Br₂ represents a redox and decomposition reaction. This is because silver bromide (AgBr) is breaking down into silver (Ag) and bromine (Br₂) when it is exposed to light, which is characteristic of a decomposition reaction. At the same time, there is a transfer of electrons occurring, as AgBr is being reduced to Ag and Br₂ is being oxidized, so it is also a redox reaction. The process is triggered by light, which implies it is photochemical in nature, but this was not one of the options.
Regarding the energy aspect, whether the reaction is exothermic or endothermic cannot be determined simply from the equation. However, since the light is necessary to initiate the reaction and is absorbed, it is typically considered endergonic because energy is being absorbed to drive the decomposition.