Assertion (A). Spontaneous process is an irreversible process and may be reversed by some external agency.
Reason (R). Decrease in enthalpy is a contributory factor for spontaneity

Assertion (A): Spontaneous process is an irreversible process and may be reversed by external agency Reason (R): Decrease in enthalpy is a contributory factor for spontaneity.

Assertion:Spontaneous process is an irreversible process and may be reversed by some external agency. Reason:Decrease in enthalpy is a conrtributory factor for spontaneity.

A spontaneous process is an irreversible process and may only by reserved by some external agency. a) Decrese in enthalpy is the only criterion for spontaneity. Do you agree? Why? b) Calculate the work done for the reversible isothermal expansion of 1 mole of an ideal gas at 27^oC , from a volume of 10 dm^3 to a volume of 20 dm^3.

Why are spontaneous/natural processes irreversible?

Assertion : All spontaneous processes are thermodynamically irreversible. Reason : In a reversible isothermal process, there is no net change in entropy.

What are reversible and irreversible processes? Give some examples of each.

Assertion : An exothermic process which is non-spontaneous at high temperature may become spontaneous at low temperature. Reason : Spontaneous process is an irreversible process and may be reversed by some external agency.