For the reaction $2 \ NO_{2(g)} \rightleftharpoons N_2O_{4(g)}$,when $\Delta S = -176.0 \ J \ K^{-1} \ mol^{-1}$ and $\Delta H = -57.8 \ kJ \ mol^{-1}$,the magnitude of $\Delta G$ at $298 \ K$ for the reaction is $...... \ kJ \ mol^{-1}$. (Nearest integer)
- A$15$
- B$10$
- C$5$
- D$8$
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The reaction $MgO_{(s)} + C_{(s)} \to Mg_{(s)} + CO_{(g)}$,for which $\Delta_r H^o = +491.1 \ kJ \ mol^{-1}$ and $\Delta_r S^o = 198.0 \ J \ K^{-1} \ mol^{-1}$,is not feasible at $298 \ K$. The temperature above which the reaction will be feasible is ..... $K$.
DifficultJEE MAIN 2019
View SolutionThe spontaneous nature of a reaction is impossible if
Medium
View SolutionBased on the provided table, which of the following options correctly identifies the spontaneous reactions?
$\Delta_r H^{\circ}$ $\Delta_r S^{\circ}$ $\Delta_r G^{\circ}$ Spontaneity of the reaction $A$ $+$ $+$ $+$ Spontaneous at low $T$ $B$ $+$ $+$ $-$ Spontaneous at high $T$ $C$ $-$ $-$ $-$ Spontaneous at low $T$ $D$ $+$ $-$ $+$ Spontaneous at high $T$
| $\Delta_r H^{\circ}$ | $\Delta_r S^{\circ}$ | $\Delta_r G^{\circ}$ | Spontaneity of the reaction | |
|---|---|---|---|---|
| $A$ | $+$ | $+$ | $+$ | Spontaneous at low $T$ |
| $B$ | $+$ | $+$ | $-$ | Spontaneous at high $T$ |
| $C$ | $-$ | $-$ | $-$ | Spontaneous at low $T$ |
| $D$ | $+$ | $-$ | $+$ | Spontaneous at high $T$ |
State the criteria for a spontaneous process in terms of $\Delta G$ at constant pressure and temperature.
Easy
View SolutionFor a process occurring at constant temperature and pressure,which of the following is true at equilibrium?
Easy
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