question

(i)     what is the role of  activated charcoal in gas mask?

(ii)     a colloidal sol is prepared by the given method in the figure.what is the charge         on hydrated ferric oxide collodial particles formed in the test tube? how is the sol          represented?   

 

(iii)     how does chemisorption vary with temperature?

 

 

 

 

 

 

 

 

358