JEE MAIN - Chemistry (2007 - No. 7)
Identify the correct statement regarding a spontaneous process :
For a spontaneous process in an isolated system, the change in entropy is positive
Endothermic processes are never spontaneous
Exothermic processes are always spontaneous
Lowering of energy in the reaction process is the only criterion for spontaneity
Explicação
Spontaneity of reaction depends on tendency to acquire minimum energy state and maximum randomness. For a spontaneous process in an isolated system the change in entropy is positive.