Which of the following conditions are not suitable for a spontaneous reaction?
- A$\Delta H < 0$ and $\Delta S > 0$ at low temperature.
- B$\Delta H < 0$ and $\Delta S < 0$ at high temperature.
- C$\Delta H < 0$ and $\Delta S < 0$ at low temperature.
- D$\Delta H > 0$ and $\Delta S > 0$ at high temperature.
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Similar Questions
For a reaction at $25\,^oC$,the enthalpy change $(\Delta H)$ and entropy change $(\Delta S)$ are $-11.7 \times 10^3\, J \, mol^{-1}$ and $-105 \, J \, mol^{-1} K^{-1}$ respectively. The reaction is:
Medium
View SolutionIdentify from the following the correct set of thermodynamic conditions for the reaction to be spontaneous below equilibrium temperature.
$2 \, mol$ of zinc is dissolved in $HCl$ at $25 \, ^\circ C$. The work done in an open vessel is: (in $, kJ$)
Medium
View SolutionCompare the following criteria for spontaneity of a reaction based on the values of $\Delta_{\text{r}}H^0$,$\Delta_{\text{r}}S^0$,and $\Delta_{\text{r}}G^0$:
$\Delta_{\text{r}}H^0$ $\Delta_{\text{r}}S^0$ $\Delta_{\text{r}}G^0$ Description $(a) (+)$ $(-)$ $(+)$ $(i) \text{ Non-spontaneous at all temperatures}$ $(b) (-)$ $(-)$ $(-)$ $(ii) \text{ Spontaneous at low temperatures}$ $(c) (-)$ $(+)$ $(-)$ $(iii) \text{ Spontaneous at all temperatures}$
| $\Delta_{\text{r}}H^0$ | $\Delta_{\text{r}}S^0$ | $\Delta_{\text{r}}G^0$ | Description |
|---|---|---|---|
| $(a) (+)$ | $(-)$ | $(+)$ | $(i) \text{ Non-spontaneous at all temperatures}$ |
| $(b) (-)$ | $(-)$ | $(-)$ | $(ii) \text{ Spontaneous at low temperatures}$ |
| $(c) (-)$ | $(+)$ | $(-)$ | $(iii) \text{ Spontaneous at all temperatures}$ |
Medium
View SolutionCalculate the work done if $1 \ mole$ of a certain gas is compressed isothermally and reversibly at $300 \ K$ from an initial pressure $x \ bar$ to a final pressure $2x \ bar$ $[R = 8.314 \ J \ K^{-1} \ mol^{-1}]$. (in $kJ$)
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