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Adsorption is a surface phenomenon and i...

Adsorption is a surface phenomenon and it differs feom adsorption which occurs throughout the body of the substance which absorbs. In physisorption, the attractive forces are mainly van der Waals' forces while in chemisorption actual bonding occurs between the particles of adsorbent and adsorbente. Generally, easily liquefying gases are adsorbed more easily on the surface of a solid as compared to teh gases whihc are liquefied with difficult. Adsorption increases with the increases in pressure and decreases as the temperature is increases.
The ease with which the gases `H_(2),CH_(4),CO_(2)and NH_(3)` are adsorbed on the surface of charcoal is :

A

`H_(2) gt CH_(4) gt CO_(2) gt N H_(3)`

B

`CH_(4) gt CO_(2) gt NH_(3) gt H_(2)`

C

`CO_(2) gt NH_(3) gt H_(2) gt CH_(4)`

D

`NH_(3) gt CO_(2) gt CH_(4) gt H_(2).`

Text Solution

Verified by Experts

The correct Answer is:
D
`NH_(3)` is liquefied most readily while `H_(2)` is most difficult to be liquefied.
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Adsorption is a surface phenomenon and it differs feom adsorption which occurs throughout the body of the substance which absorbs. In physisorption, the attractive forces are mainly van der Waals' forces while in chemisorption actual bonding occurs between the particles of adsorbent and adsorbente. Generally, easily liquefying gases are adsorbed more easily on the surface of a solid as compared to teh gases whihc are liquefied with difficult. Adsorption increases with the increases in pressure and decreases as the temperature is increases. According to adsorption theory of catalysis, the speed of the reaction increases because

Knowledge Check

  • Adsorption is a surface phenomenon and it differs feom adsorption which occurs throughout the body of the substance which absorbs. In physisorption, the attractive forces are mainly van der Waals' forces while in chemisorption actual bonding occurs between the particles of adsorbent and adsorbente. Generally, easily liquefying gases are adsorbed more easily on the surface of a solid as compared to teh gases whihc are liquefied with difficult. Adsorption increases with the increases in pressure and decreases as the temperature is increases. The effect of pressure on adsorption is high if:

    A
    temperature is low
    B
    temperature is high
    C
    temperature is neither low nor high
    D
    charcoal powder is replaced by charcoal pieces.

  • Adsorption is a surface phenomenon and it differs feom adsorption which occurs throughout the body of the substance which absorbs. In physisorption, the attractive forces are mainly van der Waals' forces while in chemisorption actual bonding occurs between the particles of adsorbent and adsorbente. Generally, easily liquefying gases are adsorbed more easily on the surface of a solid as compared to teh gases whihc are liquefied with difficult. Adsorption increases with the increases in pressure and decreases as the temperature is increases. Whihc one of the followig is wrong about chemisorption ?

    A
    It involves the formation of a compound on the su rface of solid adsorbent
    B
    It is specific in nature
    C
    It first increases with increase in temperature and then decreases
    D
    It is reversible in nature.

  • Adsorption is a surface phenomenon and it differs feom adsorption which occurs throughout the body of the substance which absorbs. In physisorption, the attractive forces are mainly van der Waals' forces while in chemisorption actual bonding occurs between the particles of adsorbent and adsorbente. Generally, easily liquefying gases are adsorbed more easily on the surface of a solid as compared to teh gases whihc are liquefied with difficult. Adsorption increases with the increases in pressure and decreases as the temperature is increases. Freunlich adsorption isotherm gives a straight line on plotting :

    A
    x/m vs P
    B
    log x/m vs P
    C
    log x/m vs log P
    D
    x/m vs 1/P.

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