Difference between Adsorption and Absorption :-

Types of adsorption :- It is two types :-

i). Physical adsorption (Physisorption) :- It has following characteristic :-

• It is non-specific in nature.
• Adsorbed and adsorbent are held together by weak Vander walls’s force.
• As the temperature increases rate of adsorption decreases due to increase in kinetic energy of gaseous molecule.
• As the pressure increases rate of adsorption increases because in such case multi molecular layer in obtained.
• It forms multimolecular layer.

  (ii) Chemical adsorption (Chemiosorption) :- It has following characteristic :-

• It is specific in nature it means specific adsorbed adsorb over specific adsorbent.
• Adsorbed are held over the adsorbent through chemical bond.
• Temperature :- In such adsorption initially rate of adsorption increases by increase in temperature because for chemical reaction molecules are required energy that is known as activation energy so after getting activation energy,further increase in temperature rate of adsorption desorption decreases.
• Pressure :- Initially increase in pressure increases the rate of adsorption further increases in pressure rate of adsorption does not change. It Happens because when adsobed covered the adsorbent so no surface is exposed for further adsorption that’s why further increase in pressure has no effect.
• It forms unimolecular layer.

• Surface Chemistry English

  1 / 19

  Bredig's arc method can't be used for the preparation of    the which of the following metal sol?

  Cu

  K

  Au

  Pt

  2 / 19

  Catalytic property generally shown by-

  transition metals

  non-transition metals

  inner transition metals

  representative elements

  3 / 19

  Catalyst used in the hydrogenation of oil-

  Pt

  Ni

  Mo

  V₂O5

  4 / 19

  Which catalyst is sensitive to change in temperature?

  TnO2

  Pt

  Zymase

  Ni

  5 / 19

  The dispersion of liquid in a liquid is called

  Gel

  froath

  Emulsion

  aerosol

  6 / 19

  Milk is an example of-

  froath

  emulsion

  Gel

  sol.

  7 / 19

  The purification of colloidal solution is done by-

  filtration

  centrifugation

  Dialysis

  osmosis

  8 / 19

  Which among the following property of colloidal solution is independant of charge-

  Electro-osmosis

  Tyndal effect

  Coagulation

  Electric particle conduction

  9 / 19

  Which one of the following is a lyophilic colloid?

  Milk

  Gum

  fog

  blood

  10 / 19

  Correct for the adsorption of gas on solid-

  (i) According to freundlich adsorption isotherm the    amount of adsorption = kPⁿ

  (ii) According to freundlich adsorption isotherm, the quantity of adsorption = kpm^1/m

  (iii) According to Langmuir adsorption isotherm the quantity     of adsorption = aP (1+bP)

  (iv) At low temperature freundlich isotherm fails

  (i) and (ii)

  (iii) and (iv)

  (i) and (iii)

  (ii) and (iv)

  11 / 19

  Lyophilic sol. are stable due to-

  Charge on the particles

  Large size of the particles

  Small size of the particles

  Layer of dispersion medium on the particles.

  12 / 19

  Tyndall effect is not observed in-

  Suspensions

  Emulsions

  Sugar solution

  Gold solution

  13 / 19

  The size of colloidal particles ranges between-

  10 -7 to 10-9 cm

  10-9 to 10-11cm

  10-5 to 10-7cm

  10-2to 10-3 cm

  14 / 19

  The reason of Brownian motion is-

  conversion of vapour into liquid

  flow of electricity

  unbalanced bombardment of the particles by the molecules of dispersion medium

  force of attraction between dispersed phase and dispersion medium

  15 / 19

  An example of biological catalyst is-

  an enzyme

  a carbohydrate

  an amino acid

  a nitrogenous base

  16 / 19

  Catalyst increases the rate of reaction.

  by decreasing the enthalpy

  by decreasing internal energy

  by decreasing the activation energy

  by increasing the activation enrgy

  17 / 19

  Which among the following show the characteristics of a  catalyst.

  It changes the equilibrium point

  It starts the reaction

  It increases the rate of reaction

  It increases the kinetic energy of molecules

  18 / 19

  The process of adsorption is-

  exothermic

  endothermic

  exothermic and endothermic

  None of these

  19 / 19

  1. The material on the surface of which adsorption takes place is called-

  Adsorbent

  Adsorption

  Adsorbate and adsorbent

  None of these

  Your score is

  The average score is 68%

  0%

  Restart quiz

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