Question

(i) What is the role of activated charcoal in gas mask? (ii) A colloidal sol is prepared by the given method in figure. What is the charge on hydrated ferric oxide colloidal particles formed in the test tube? How is the solution represented?
(iii) How does chemisorption vary with temperature?

Answer 1

(i) Activated charcoal is used in gas masks to absorb poisonous gases and prevent the workers from being inhaled.
(ii) When $FeC{l}_3$ is added to $NaOH$ solution, a negatively charged sol is obtained with adsorption of $O{H}^{-}$ ions. Sol is represented as $F{e}_2{O}_3.x{H}_{2}O/O{H}^{-}$
(iii) High temperature is favourable for adsorption. It increases with the increase of temperature.