Question

# In which condition, adsorption will not take place?

A
When ΔH is negative
B
When ΔH is positive ΔS is positive
C
When ΔH is positive and ΔS is negative
D
When ΔG is negative.

Solution

## The correct option is D When $$\Delta H$$ is positive and $$\Delta S$$ is negativeAdsorption takes place only when $$\Delta G <0$$ i.e. $$\Delta H- T \Delta S <0$$.So, if $$\Delta H$$ is positive and $$\Delta S$$ is negative then $$\Delta H- T \Delta S$$ will always be positive. So adsorption will not take place.Chemistry

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