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Physisorption...

Physisorption

A

Needs high activation energy

B

Depends on the surface area

C

Results into unimolecular layer

D

Increases with the increase of temperature

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The correct Answer is:
B
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Which of the following statements is not true? a. Both physisorption and chemisorption are exothermic. b. Physisorption occurs with increase of free energy. c. Physisorption requires low activation energy but chemisorption requires high activation energy. d. The magnitude of chemisorption increases and that of physisorption decreases with rise in temperature.

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.

Giving appropriate examples, explain how the types of processes of adsorption (physisorption and chemisorption) are influenced by the prevailing temperature , the surface area of adsorbent and the activation energy of the process?

Column - I and Column - II contains four emtries each. Entries of Column -I are to be matched with some entries of Column - II . One or more than one entries of Column -I may have the matching with the same entries of Column - II. {:("column-I","column-II"),("(A) Chemisorption","(P) Not specific and decreases with temperature "),("(B) physisorption",(Q) "sepecific and increases with temperature"),("(C) Desorption of a solute on liquid surface","(R) Increases the surface tension of the liquid "),("(D)Adsorption of a solute on a liquid ","(S) Decreases the surface tension of the liquid "):}

How many of the following quantities show increase in their value of increasing temperature? a. Extent of physisorption of gases on solids. b. Electrical conductivity of an electrolyte solution. c. Electrical conductivity of an electrolyte solution. d. Ionic product of water. e. Vapour pressure of a pure and liquid. f. Vapour pressure of an ideal solution which follows Rault's law, (keeping composition same) g. Solubility of gases in liquids. h. Reducing power of carbon monoxide for extraction of metals Correct answer:

each question contain STATEMENT-1(Assertion ) and STATEMENT - 2 (reason). examine the statement carefully and work the correct answer accoridng to the instructions given below : STATEMENT-1: More heat evolved in physiorpiton than in chemisorption. STATEMENT-2: Molecules of adsorbate and adsorbent are held by van der Waal's forces in physisorption and by chemical bonds in chemisorption.

Fill in the blanks by putting appropriate choices. During adsorption there is _______ in enthalpy and _______ in the entropy of a system by adsorption is a spontaneous process and thus DeltaG must be ________. Rate of physisorption ________ with increase in pressure.

Adsorption is the tendency of accumulation of molecular species at the surface of solid or liquid. Depending upon the nature of bonds or forces of attraction between adsorbate and adsorbent. It is classofied between physisorption and chemisorption. Which of the following characteristics is not correct for physical adsorption?

Adsorption is the tendency of accumulation of molecular species at the surface of solid or liquid. Depending upon the nature of bonds or forces of attraction between adsorbate and adsorbent. It is classofied between physisorption and chemisorption. Which of the following gases is adsorbed most by activated charcoal?

Adsorption is the tendency of accumulation of molecular species at the surface of solid or liquid. Depending upon the nature of bonds or forces of attraction between adsorbate and adsorbent. It is classofied between physisorption and chemisorption. Which of the following statements are correct? (More than one correct)

AAKASH INSTITUTE ENGLISH-SURFACE CHEMISTRY -ASSIGNMENT SECTION - A
  1. The interface between a solid and gas may be represented by {:("(a...

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  2. Which one of the following is not the characteristic of physiorption...

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  3. Physisorption

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  4. Freundlich isotherm explains the behaviour of adsorption

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  5. Which statement is incorrect for chemisorption?

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  6. Name the catalyst and promoter in the Haber's process for the manufact...

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  7. Following reaction is an example of 4NH(3)(g)+50(2)(g)overset(Pt(s))...

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  8. Which one of the following is the source of enzyme pepsin?

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  9. In Ostwald's process for the manufacture of nitric acid the catalyst...

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  10. Dispersed phase and dispersion medium of gel are respectively

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  11. Which of the following is not an example of intrinsic (lyophilic) c...

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  12. O/W type emulsion means

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  13. During synthesis of ammonia by Haber's process, 'CO' acts is

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  14. Spontaneous adsorption of a gas on a solid surface is exothermic proc...

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  15. The minimum number of millimoles of electrolyte required to coagulat...

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  16. Freundlich isotherm explains the behaviour of adsorption

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  17. In which of the following process adsorption plays an important role...

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  18. What role does adsorption play in heterogeneous catalysis?

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  19. Which statement is not correct for zeolites?

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  20. Enzymes are

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