Which forms multimolecular layer during adsorption?
Which forms multimolecular layer during adsorption?
Physical absorption
Solution : Physical absorption forms multimolecular layer due to diffusion through pores and establishes weak force with solid.
What is the meaning of multimolecular layer?
(ˌmʌltɪməˈlɛkjʊlə) adj. (Chemistry) comprising or involving two or more molecules.
Is absorption is always Multimolecular?
False. Physisorption is multimolecular but chemisorption is unimolecular.
What is adsorbing agent?
The adsorbent is the separating agent used to express the difference between molecules in a mixture: adsorption equilibrium or kinetics. Adsorbents are mostly microporous, high specific surface materials (200 – 2000 m2/g)
What are Multimolecular colloids?
Multimolecular Colloids: When a large number of atoms or small molecules (having diameters of less than 1nm) of a substance combine together in a dispersion medium to form aggregates having size in the colloidal range, the colloidal solutions thus formed are called multimolecular colloids.
Why do Physisorptions form Multimolecular layers?
When the surface of the adsorbent is coverd with one layer, no further reaction can take place. Physisorption is simply by van der Waals forces. So any number of layers may be formed one over the other on the surface of the adsorbent.
Why physisorption is Multimolecular?
On the other hand, physical adsorption is due to van der Waals forces between adsorbent and adsorbate molecules. So any number of layers can be formed one over the other on the surface of the adsorbent. Therefore, physical adsorption is multimolecular.
Why physical adsorption is multilayered while chemical adsorption is Monolayered?
Solution : In physical adsorption, there are weak van der Waals forces. Therefore, it forms multilayers. In chemisorption, adsorbate is attached by chemical bond. There is a strong force of attraction.
What are Protectives and adsorbents?
Protectives and adsorbents adsorb toxins and provide a protective coating on inflamed mucosa. Bismuth subsalicylate has an anti – prostaglandin action in addition to its adsorbent properties. Uses: Protectants and adsorbents are used for the symptomatic therapy of acute diarrhea.
What are adsorbents drugs?
Adsorbents (eg, attapulgite, aluminum hydroxide) help patients have more control over the timing of defecation but do not alter the course of the disease or reduce fluid loss. Antisecretory agents (eg, bismuth subsalicylate) may be useful.
What are Multimolecular colloids give one example?
Examples of multimolecular colloid: -Gold sol and sulphur sol consist of thousands of particles held together by vander Waal’s forces. Examples of macromolecular colloids: -Macromolecules like starch, cellulose, proteins, polymer like rubber, and gelatin.
How are Multimolecular colloids formed?
Multimolecular colloids are formed by the aggregation of a large number of simple molecules, macromolecular colloids consists of macromolecules having size in the colloidal range. On the other hand, associated colloids also called micelles, are generally electrolytes. They exist as ions at low concentration.