The substance that gets adsorbed on the surface of the solid is called?
The substance that gets adsorbed on the surface is known as adsorbate.
Water vapours are adsorbed by
Water vapours gets adsorbed by Silica gel.
Adsorption is accompanied by
Adsorption involve decrease in entropy because gas when gas adsorbed randomness decreases. Also it is exothermic process.
The phenomenon in which adsorption and absorption takes place simultaneously is called?
Adsorption and absorption is commonly known as sorption.
Which of the following is true about chemisorption?
Chemical Reaction take place between adsorbate and adsorbent in chemisorptions. Therefore it is specific in nature.
The physical adsorption is due to
Vander waal forces are weak force of attractions, responsible for physisorption, as no chemical reaction taking place here.
Substances that alter the rate of a chemical reaction without being used up in a chemical reaction is known as
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.
The process of separation of colloids by passing through semi permeable membrane is called?
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 – liquid sols are known as
Liquid in liquid sols are emulsions
Whipped cream is an example of
Whipped cream is example of foam.
The curve showing the variation of adsorption with pressure at constant temperature is known as
Constant Temperature means isotherm.
Which physical quantity remain unaffected when a reversible reaction is carried out in presence of a catalyst
Equillibrium constant is independent of catalyst. Catalyst doesnot change equilibrium constant.
Adsorption is a
Adsorption is entirely a bulk phenomenon while absorption is bulk phenomenon.
Which is correct in case of Vander waals adsorption?
Physiadsorption is favoured only at low temperature and high pressure.
Which adsorption takes place at low temperature?
Physical adsorption is favoured at low temperature because it involves only vanderwall interactions between adsorbate and adsorbent.
Pt and Pd adsorb large volume of hydrogen under specific conditions. The hydrogen so adsorbed is called?
Adsorption of hydrogen by metal like Pt is occlution and hydrogen is known as occluded hydrogen.
Which of the following is not exhibited by sols?
Absorption, Tyndall effect and flocculation all are related to sol but paramagnetism is not represented by sol.
Hydrophilic colloids are stable due to
This makes the colloid stable.
Which of the following methods is used for sol destruction?
Electrolyte makes the colloid destroy.
Flocculation value is expressed in terms of
In aerosol the dispersion medium is
Dispersion medium is gas.
Fog is a colloidal solution of
Dispersed phase is liquid, dispersion medium is gas.
The basic principle of Cottrell precipitator is
It is used for decreasing air pollution by neutralizing the colloid.
In which of the following systems, the dispersed phase and dispersion medium are both solid?
It is a Sol type of colloid.