Explanation
Physisorption is reversible and occurs at low tempeature.
In physical adsorption , van der waal’s force is present between adsorbate and adsorbent.
Rate of physisorption increases with decreasing temperature.
Activated charcoal is used for decolourising and deodorising sugar solution.
Adsorption of a gas on solid depends upon nature of gas and solid, pressure and temperature.
In autocatalysis , the product catalyses the reaction.
Catalyst decreases the activation energy thus increases the rate of reaction.
Enzymes are biological catalysts which catalyze the biochemical reactions in living organisms.
Hydrolysis of urea by urease is an example of biochemical catalysis.
Enzymes are biological catalyst.
The decomposition of H2O2 can be slowed by the addition of acetamide.Catalytic poisons decrease or inhibit the activity of catalysts.
Catalyst decreases the activation energy of reaction and hence increases the rate of reaction.
A catalyst is not consumed in a reaction. It decreases the activation energy and increases the rate of reaction.
Active charcoal has more adsorption power since it has greater surface area.
Gold sol contains several atoms of Gold . It is a multimolecular colloid.
Casein can stabilise cow milk.
Potash Alum can act as coagulating agent thus can stop bleeding.
When a beam of light passess through a colloidal solution it is scattered.
Gold number is a measurement of protective power of lyophillic colloids.Lower is the value of Gold number, better is the protective power of a colloid.
Through dialysis and electrolysis colloidal solutions can be purified.
Particles in colloidal solution is comparatively small as compared to true solution .Hence colligative properties values are above in small order.
Emulsion is liquid-liquid colloid. Example :- Milk, Vanishing cream, butter etc.
Sodium stearate is an example of associated colloids. Proteins, starch colloidal solution is an example of Macromolecular colloids.
Size of colloidal particles are in a range of 100 nm – 1nm.
Sb2S3 is an anionic sol . So, Al3+ (cation of highest valency among the options) would be most effective in coagolation.
As2S3 is negatively charged sol. So, Ion bearing highest charge will be best for coagulation.
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