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

The charge on $Fe(OH)_3$ sol is due to the adsorption of which of the following?

Plot of $\log \left( \frac{x}{m} \right)$ against $\log P$ is a straight line inclined at an angle of $45^{\circ}$. When the pressure is $0.5 \ atm$ and Freundlich parameter $(K)$ is $10$,then the amount of solute adsorbed per gram of adsorbent is .......... $g$ $(\log 5 = 0.699)$.

Which of the following processes has a negative $\Delta S$ (change in entropy)?

Activated charcoal is used to remove colouring matter from pure substances. It works by

Which among the following is true for chemisorption?