The extent of adsorption of adsorbate from the solution phase increases with:
Increase in the amount of adsorbate in solution.
The decrease in surface area of the adsorbent
Increase in temperature of the solution
The decrease in amount of adsorbate in solution
The extent of adsorption, when we talk about solution phase, depends on the concentration of the solute in a solution.
As the concentration of adsorbate increases in the solution, the adsorption also increases.
As the surface area of the adsorbent decreases then the adsorption decreases not increase.
As the temperature of the solution increases then the adsorption decrease not increase.
As the amount of adsorbate in solution decreases then the adsorption also decreases not increase.
Therefore, the option number (1) is correct.
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