Test: Surface Chemistry - 2 (Old NCERT) - JEE MCQ

The substance that gets adsorbed on the surface is known as adsorbate.

Water vapours gets adsorbed by Silica gel.

Adsorption involve decrease in entropy because gas when gas adsorbed randomness decreases. Also it is exothermic process.

Adsorption and absorption is commonly known as sorption.

Chemical Reaction take place between adsorbate and adsorbent in chemisorptions. Therefore it is specific in nature.

Vander waal forces are weak force of attractions, responsible for physisorption, as no chemical reaction taking place here.

Catalyst only increases or decreases the activation energy of a reaction, It doesnot get used up in reaction.

Enzymes are biological catalyst, they catalize different chemical reactions in body.

Dialysis we use, salt solution of approximately same concentration outside the artificial blood capillary, so that urea comes out of the blood, but other useful substances like NaCl , blood cell etc does not. Blood is a colloid.

Liquid in liquid sols are emulsions

Whipped cream is example of foam.

Constant Temperature means isotherm.

Equillibrium constant is independent of catalyst. Catalyst doesnot change equilibrium constant.

Adsorption is entirely a bulk phenomenon while absorption is bulk phenomenon.

Physiadsorption is favoured only at low temperature and high pressure.

Physical adsorption is favoured at low temperature because it involves only vanderwall interactions between adsorbate and adsorbent.

Adsorption of hydrogen by metal like Pt is occlution and hydrogen is known as occluded hydrogen.

Absorption, Tyndall effect and flocculation all are related to sol but paramagnetism is not represented by sol.

This makes the colloid stable.

Electrolyte makes the colloid destroy.

Fact

Dispersion medium is gas.

Dispersed phase is liquid, dispersion medium is gas.

It is used for decreasing air pollution by neutralizing the colloid.

It is a Sol type of colloid.