Factors Affecting Adsorption
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Discuss the effect of pressure and temperature on the adsorption of gases on solids.
Identify the gas which is readily adsorbed by activated charcoal?
Why adsorption is a spontaneous process?
The volume of gases NH3, CO2 and CH4 adsorbed by one gram of charcoal at 298 K are in
- CO2> NH3> CH4
- CH4> CO2> NH3
- NH3> CH4> CO2
- NH3 > CO2> CH4
The mass of oxalic acid crystals required to prepare
What are the factors which influence the adsorption of a gas on a solid?
The volumes of gases H2, CH4, CO2 and NH3 absorbed by 1 g of charcoal at 288 K are in the order:
H2>CH4>CO2>NH3
CH4>CO2>NH3>H2
CO2>NH3>H2>CH4
NH3>CO2>CH4>H2
Give reason why a finely divided substance is more effective as an absorbent?
Which gas is strongly adsorbed by charcoal -
- NH3
- H2
- N2
- CO
Gas Critical temp./K
CO2 304
SO2 630
CH4 190
H2 33
- CO2
- SO2
- CH4
- H2
Why is adsorption an exothermic process?
The variation of amount of gas absorbed per gram of adsorbent with pressure at different temperatures is given in the adjoining fig. Which of the following is correct relation?
- T3 > T2 > T1
- T2 > T1 > T3
- T1 = T2 = T3
- T1 > T2 > T3
When the temperature is lowered and pressure is raised, the adsorption of a gas on a solid [MP PMT 1997]
Decreases
Remains unaffected
Increases
Decreases first then increases
The volumes of gases H2, CH4, CO2 and NH3 absorbed by 1 g of charcoal at 288 K are in the order:
- CH4 > CO2 > NH3 > H2
- CO2 > NH3 > H2 > CH4
- NH3 > CO2 > CH4 > H2
- H2 > CH4 > CO2 > NH3
- True
- False
- True
- False
Gas | CO2 | SO2 | CH4 | H2 |
Critical temp./K | 304 | 630 | 190 | 33 |
- CO2
- SO2
- H2
- CH4
- log c
- log k
- k
- 1n
Which reaction gives colloidal solution
2HNO3+3H2S→3S+4H2O+2NO
Cu+CuCl2→Cu2Cl2
Cu+HgCl2→CuCl2+Hg
2Mg+CO2→2MgO+C