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

Question

Assertion: An exothermic process which is nonspontaneous at high temperature may become spontaneous at low temperature. Reason: Spontaneous process is an irreversible process and may be reversed by some external agency. (A) If both assertion and reason are true and reason is the correct explanation of assertion (B) If both assertion and reason are true but reason is not the correct explanation of assertion (C) If assertion is true but reason is false (D) If both assertion and reason are false

Tardigrade Admin · Accepted Answer

Δ G = Δ H - TΔ S For exothermic process, Δ H = - ve. For Δ G to be -ve (fo spontaneous process), Δ H > TΔ S which is possible only at low temperature.

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

If both assertion and reason are true and reason is the correct explanation of assertion

If both assertion and reason are true but reason is not the correct explanation of assertion

If assertion is true but reason is false

If both assertion and reason are false

$Δ G = Δ H - T Δ S$
For exothermic process, $Δ H = - v e$ . For $Δ G$ to be $- v e$ (fo spontaneous process), $Δ H > T Δ S$ which is possible only at low temperature.

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