First slide

Gibb's Helmholtz equation

Question

A process is spontaneous at all temperatures when

Moderate

A

$\large \Delta H\,\,=\,\,-ve,\,\,\Delta S\,\,=\,\,+ve$
B

$\Delta H\,\,=\,\,+ve,\,\,\Delta S\,=\,-ve$
C

$\Delta H\,\,=\,\,-ve,\,\,\Delta S\,=\,-ve$
D

$\Delta H\,\,=\,\,+ve,\,\,\Delta S\,=\,+ve$

Solution

$∆ G = ∆ H - T ∆ S; When ∆ H = - ve and ∆ S = + ve; ∆ G = - ve - T (+ ve); ∆ G is always - ve; Process is spontaneous at all temperatures;$

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