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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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