Q. 215.0( 1 Vote )

(a) A colloidal s

Answer :

(a) A negative charge is developed in the particles. This occurs because the precipitate adsorbs one of the ions of the electrolyte on its surface.


The sol formed can be represented as AgI/I - .


(b) Heterogenous catalysis is one of the applications of adsorptions -


The reactants get adsorbed on the solid surface of the catalyst. Thus this helps in increasing the rate of reaction.


Manufacture of ammonia by the Haber’s process using iron as a catalyst and manufacture of sulphuric acid by the contact process by using finely divided nickel are some good examples of heterogenous catalysis.


(c) Na3PO4


Reason:


This is determined by the Hardy - Schulze rule. This rule states that greater the valency of the flocculating ion, greater is its power to cause precipitation.


Since, in the above problem PO43 - has the greatest valency it has the greatest coagulating power.


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