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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 statements pertaining to the adsorption of a gas on a solid surface are (i) Adsorption is always exothermic (ii) Physisorption may transform into chemisorption at high temperature (iii) Physisorption increases with increasing temperature but chemisorotion decrease with increasing temperature (iv) Chemisorption is more exothermic than physisoption, however, it is very slow due to higher energy of activation

In a particular case of physisorption, magnitude of enthalpy change and entropy change were observed to be 28 kJ/mole and 100 J/mole-K. Calculate the minimum temperature (in .^(@)C ) above which physisorption will become non spontaneous.

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.

AAKASH INSTITUTE-SURFACE CHEMISTRY -ASSIGNMENT SECTION - A
  1. The interface betbeen 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 ostwold'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 rquired to coagulate...

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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. Adsorption Theory Of 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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