(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?

 

 

 

 
 
 
 
 

Answers (1)

(i)      Activated charcoal in gas mask adsorbs poisonous gases.

(ii)     Negative charge ; Fe_{2}O_{3}.xH_{2}O/OH^{-}

(iii)     Chemisorption initally increases then decreases as the temperature increases.It is due to the fact that heat supplied intially acts as activation energy.The decrease afterwards is due to the exothermic nature of adfsorption equilibrium.

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