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(B) The spontaneity of a reaction is determined by the Gibbs free energy change,given by the equation: $\Delta G = \Delta H - T \Delta S$.For a reacti

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$\Delta_r H^{\circ} = +ve, \Delta_r S^{\circ} = +ve, 	ext{ at high } T$.

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(B) The spontaneity of a reaction is determined by the Gibbs free energy change,given by the equation: $\Delta G = \Delta H - T \Delta S$.For a reaction to be spontaneous,$\Delta G$ must be negative $(\Delta G If $\Delta H > 0$ (endothermic) and $\Delta S > 0$ (increase in entropy),the reaction becomes spontaneous only when the term $T \Delta S$ is larger than $\Delta H$,which occurs at high temperatures.ConditionSpontaneity$\Delta H > 0, \Delta S > 0$Spontaneous at high $T$$\Delta H Spontaneous at low $T$$\Delta H  0$Spontaneous at all $T$$\Delta H > 0, \Delta S Non-spontaneous at all $T$

For a reaction to be spontaneous,the required conditions are

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