Which of the following statements is not correct?

Between water and an $NaCl$ solution,which will have a higher surface tension? (Effect of solute on surface tension)

Which of the following is not a favourable condition for physical adsorption?

Which of the following represents the Freundlich adsorption isotherm equation for the adsorption of a gas on a solid (where $n > 1$)?

During the adsorption of a gas on a solid at low temperature,which of the following thermodynamic conditions is correct?

The correct statement$(s)$ pertaining to the adsorption of a gas on a solid surface is (are):
$(A)$ Adsorption is always exothermic.
$(B)$ Physisorption may transform into chemisorption at high temperature.
$(C)$ Physisorption increases with increasing temperature but chemisorption decreases with increasing temperature.
$(D)$ Chemisorption is more exothermic than physisorption,however it is very slow due to higher energy of activation.