spontaneous reactions occurs on its own naturally and non-spontaneous reactions occur due to some external force.
Spontaneous reactions occur under natural conditions without any external force. The enthalpy change of spontaneous reactions is negative. Combustion reaction is an example of spontaneous reaction.
Non-Spontaneous reactions needs an external factor for energy input to proceed. The enthalpy change of spontaneous reactions is positive. Reaction between oxygen and atmospheric nitrogen is an example of non-spontaneous reaction.
Non-spontaneous process can occur. Uphill flow of water with the use of pump is a non-spontaneous process.
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