First slide

Gibb's Helmholtz equation

Question

For the reaction $\large {{I}_{2(g)}}\rightleftharpoons {{I}_{2(s)}};\,\,\Delta H\,=\,-ve.$ Then choose the correct statements from the following
a) The process is spontaneous at all temperatures
b) The process is accompained by an increase entropy
c) The process is accompained by a decrease in entropy
d) The process is accompained by a decrease in enthalpy
The correct statements are

Moderate

A

Only a, b and c
B

Only b and d
C

Only c and d
D

Only a, c and d

Solution

$a) ∆ H = - ve; gas \to solid, ∆ S = - ve; ∆ G = ∆ H - T ∆ S; ∆ G = - ve - T (-); spontaneous at low temperatures; b) ∆ S = - ve;$

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