Explanation
Size of colloidal particles is10-6 m – 10-9 m
(b) is true.
In physisorption, van der Waal’s forces are associated
Electrolytes neutralise the charge on colloidal particles and dispersion medium and coagulation takes place
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Colloidal particles of amorphous S are obtained.
Suspensions of precipitates can be converted into colloids by peptisation
In autocatalysis, a product catalyses the reaction.
Particle size of the adsorbent affects the amount of adsorption
The simplest way to check a colloidal sol is by Tyndall effect as the path of light (say from a torch) becomes visible due to scattering
Adsorbed acetic acid is called adsorbate
Alum helps in purifying water by Al3+ ions which coagulate the negative mud particles
Adsorption is an exothermic process. Hence it lowers the activation energy of the reaction
Adsorption decreases with increase of temperature
Arsenious sulphide is a negatively charged sol. Hence the coagulating powers are in the order Al3+ > Ba2+ > Na+
Rate of physisorption increases with decrease in temperature
Soap + water is an example of micelles
At isoelectric point, colloidal particles become neutral
Gold number was given by Zsigmondy.
Sedimentation potential is the reverse of electrophoresis
Electroosmosis was discovered by Reuss and Porret
A colloidal solution of cellulose nitrate in ethyl alcohol is called collodion.
Negatively charged blood solution is coagulated by Fe3+ ions
ZSM-5 (size selective catalyst) converts alcohol to petrol.
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