Explanation
Process taking place at the surface is known as surface phenomenon.
Gases having high initical temperature are adsorbed to a greater extent because they have strong van der waal’s forces of attraction.
In chemisorption, adsorption is monolayer.
In Homogenous catalysis, products and catalysts are in the same physical state.In the acid hydrolysis of methyl acetate,product and catalyst (dil. HCl / dil H2SO4 are in same (liquid) phase.
Catalyst changes the rate of the reaction by changing the activation energy.
Autocatalysis is a phenomenon in which one of its products of a reaction acts as a catalyst.
When KMnO4 solution is added to oxalic acid, the disappearance of pink colour occur initially but as soon as some MN2+ ion are formed the disappearance of colour becomes fat.
Enzymes enhance the rate of biochemical reactions.
Enzymes are biological catalysts which decrease the activation energy and increases the rate of reaction.
Enzymes acts at an optimum temperature of 25o C – 40o C . Enzymes are specific and have well defined active sites.
In Haber’s process, the reactants and catalysts are in different phase. So, is an example of heterogeneous catalysis.
Process in which freshly prepared precipitate disintegrate into colloidal solutions is known as peptisation.
Potassium stearate is an example of Micelle.
According to Hardy Schulze rule, greater the charge on oppositely charged ion, greater is its coagulating power. Order of coagulating power Na+ < Ba2+ < Al3+ .
Lyophilic sols are more stable than lyopholoic sols because colloidal particles are solvated.
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