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Class 10 Class 12
What is an adsorption isotherm and isobar?

The variation in the amount of gas adsorbed by the adsorbent with pressure at constant temperature can be expressed by means of a curve termed as adsorption isotherm.

A plot of the amount of gas adsorbed x / m against the pressure at constant temperature is called an adsorption isotherm.

A plot of the amount adsorbed x / m versus temperature at constant pressure is called an adsorption isobar.
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Why are substances like platinum and palladium often used for carrying out electrolysis of aqueous solutions?

The Plantium and palladium are used for electrolysis of aqueous solution due to the chemically inert in nature and good adsorptive capacity for hydrogen.
Because Gases like hydrogen are absorbed on the surface of platinum and palladium (adsorption) and then passes into the bulk of the adsorbent (platinum and palladium).

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Why does physisorption decrease with the increase of temperature?

It is because physical adsorption involves weak forces of attraction between adsorbent and adsorbent molecules, generally of Vander Waal's type. These forces decrease rapidly with increase in temperature.
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Why is the ester hydrolysis slow in the beginning and becomes faster after sometime?

Ester + water ---> Acid + Alcohal
The acid produced in the reaction acts as a catalysis and makes the reaction faster.

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Why are powdered substances more effective adsorbents than their crystalline forms?