Match the following :

\Delta(Parameters) \Delta _{r}H^{\ominus }   \Delta _{r}S^{\ominus }   \Delta _{r}G^{\ominus }                                                                      Description
(i)                              +\; \; \; \; \; \; \; -\; \; \; \; \; \; \; + (a) Non-spontaneous at      high temperature.
(ii)                             -\; \; \; \; \; \; \; -\; \; \; \; \; \; \; +at\; high\; T (b) Spontaneous at all temperatures
(iii)                            -\; \; \; \; \; \; \; +\; \; \; \; \; \; \; - (c) Non-spontaneous at all temperatures

 

Answers (1)

(i) - c

(ii) - a

(iii) -b

Explanation:

Parameters \Delta _{r}H^{\ominus }   \Delta _{r}S^{\ominus }   \Delta _{r}G^{\ominus }

Description

i) + - +

ΔG is positive, and ΔS is negative when we have a positive enthalpy change. So, at all temperatures, the process remains non-spontaneous

ii) - - + at a hight T

when we have a positive enthalpy change, ΔG is positive. The process will be non-spontaneous at high temperatures.

iii) - + -

When enthalpy change is negative, ΔG is negative, and ΔS is positive. Hence the process will be spontaneous at all temperatures.

 

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