Can we know whether the chemical equation is obtained through thermal decomposition,photolysis or electrolysis without performing an experiment
No, the type of decomposition reaction can be only known by performing experiment.
How will we know is material we don't know is a conductor or insulator of electricity without doing practical experiment.
Write the equation for the action of heat on :
(a) Ammonium chloride, (b) Ammonium nitrate.
State whether each reacton is an example of thermal decomposition or thermal dissociation.