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  4. In which of the following conditions, a reaction will definitely be spontaneous:

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Q. In which of the following conditions, a reaction will definitely be spontaneous:

NTA AbhyasNTA Abhyas 2022

Solution:

For a spontaneous reaction, $\Delta G < 0.$
As per the Gibbs-Helmholtz equation,
$\Delta G=\Delta H-T\Delta S$
When $\Delta H$ is negative, i.e., the reaction is exothermic and $\Delta S$ is positive, i.e., the disorder is increasing, the value of $\Delta G$ will definitely be negative and the process will be spontaneous for all temperatures.