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Why is adsorption always exothermic ?...

Why is adsorption always exothermic ?

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New bond formation takes place
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The correct statement(s) pertaining to the adsorption of a gas on a solid surface is(are) (i) adsorption is always exothermic (ii) physisorption may transform into chemsisorption transform into chemisorption at high temperature (iii) physisorption increases with increasing temperature but chemisorption decreases with increasing temperature . (iv) chemisorption is more exothermic than physisorption , however it is very slow due to higher energy of activation.

Why all adsorptions are exothermic in nature ?

Adsorption is exothermic. True/False

Assertion :- The graphical representation of physical adsorption with temp is Reason :- This is weak adsorption & adsorption is exothermic process.

Assertion: For Adsorption DeltaG,DeltaH,DeltaS all have -ve values. Reason: Adsorption is a exothermic process in which randomness decreases due to force of attraction between adsorbent and adsorbate.

Why is adsorption accompanied by the decrease of both enthalpy as well as entropy of the system? Which factors help in increasing the extent of physical adsorption of the gas on charcoal powder?

What is an 'adsorption isotherm ? Describe Freundlich adsorption isotherm.

Which one of the following statements is wrong? a. Physical adsorption of gas directly related to its critical temperature. b. Chemical adsorption decreases regularly as the temperature is increased. c. Adsorption is an exothermic process. d. A solid with a rough surface is a better adsorbent than the same solid with a smooth surface.

What is an adsorption isotherm? Describe Freundlich adsorption isotherm.

Physical adsorption is :

Knowledge Check

  • The correct statement(s) pertaining to the adsorption of a gas on a solid surface is(are) (i) adsorption is always exothermic (ii) physisorption may transform into chemsisorption transform into chemisorption at high temperature (iii) physisorption increases with increasing temperature but chemisorption decreases with increasing temperature . (iv) chemisorption is more exothermic than physisorption , however it is very slow due to higher energy of activation.

    A
    (i) and (iv) only
    B
    (ii) and (iii) only
    C
    (i),(ii) and (iv) only
    D
    All of these.
    • AAKASH INSTITUTE ENGLISH-SURFACE CHEMISTRY -TRY YOURSELF
    1. Why is adsorption always exothermic ?

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    2. What is the effect on entropy change (triangle S) in adsorption?

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    3. Which adsorption takes place at low temperature?

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    4. Low temperature is favourable for ……….. reactions.

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    5. Which type of gases are readily adsorbed by solids?

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    6. Write any two characteristics of Chemisorption.

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    7. Why does physisorption decrease with increase of temperature ?

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    8. What is the change in mass and composition of catalyst after the compl...

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    9. Write the name of scientist who suggested the term catalyst first?

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    10. Metals of how many groups of periodic table show maximum catalytic act...

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    11. Which catalyst is used to convert alcohol directly to petrol?

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    12. What are optimum temperature and pH for the enzymes to act best ?

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    13. Which enzyme converts milk into curd?

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    14. Freshly prepared precipitate sometimes gets converted to colloidal sol...

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    15. What is the difference between multimolecular and macromolecular collo...

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    16. Explain the cleansing action of soaps.

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    17. What is the dispersed phase and dispersion medium in gel?

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    18. Why true solutions do not exhibit tyndall effect?

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    19. Write the name of four methods to coagulate lyophobic colloids

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    20. What is most accepted reason for the presence of charge on colloids?

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