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प्रश्न
How is activation of adsorbent achieved?
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उत्तर
- By increasing the surface area of the adsorbent. This can be done by breaking it into smaller pieces or powdering it.
- Some specific treatments can also lead to the activation of the adsorbent. For example, wood charcoal is activated by heating it between 650 K and 1330 K in a vacuum or air. It expels all the gases absorbed or adsorbed and thus creates a space for adsorption of gases.
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संबंधित प्रश्न
Describe Freundlich adsorption isotherm.
Answer in one sentence:
Write an equation for Freundlich adsorption isotherm.
The slope and intercept for plot of `log_10 "x"/"m"` against log10P for Freundlich equation are ____________ and ____________ respectively.
In Freundlich's adsorption isotherm, when log `("x"/"m")` is plotted against log P, slope of the graph is ____________.
Which of the following curves is in accordance with Freundlich adsorption isotherm?
Freundlich adsorption isotherm is given by the expression `x/m = kp^(1/n)` which of the following conclusions can be drawn from this expression.
(i) When `1/n` = 0, the adsorption is independent of pressure.
(ii) When `1/n` = 0, the adsorption is directly proportional to pressure.
(iii) When n = 0, `x/m` vs p graph is a line parallel to x-axis.
(iv) When n = 0, plot of `x/m` vs p is a curve.
Adsorption of gases on the solid surface is generally exothermic because.
Which of the following statement is INCORRECT regarding the adsorption of a gas on the surface of the solid?
In Freundlich adsorption isotherm, slope of AB line is:
The mass of gas adsorbed, x per unit mass of adsorbed, m was measured at various x pressures p. A graph between `log "x"/"m"` and log p gives a straight line with slope equal to 2 and the intercept equal to 0.4771. The value of `"x"/"m"` at a pressure of 4 atm is ______.
[Given log 3 = 0.4771]
Adsorption of a gas follows Freundlich adsorption isotherm. x is the mass of the gas adsorbed on mass m of the adsorbent. The x plot of log `x/m` versus log p is shown in the given graph. `x/m` is proportional to ______.
For Freundlich adsorption isotherm, a plot of log (x/m) (Y-axis) and log p (x-axis) gives a straight line. The intercept and slope for the line is 0.4771 and 2, respectively. The mass of gas, adsorbed per gram of adsorbent if the initial pressure is 0.04 atm, is ______ × 10-4 g. (log 3 = 0.4771)
