During the adsorption of Krypton on activated charcoal at low temperaturea)ΔH 0d)ΔH 0Correct answer is option 'A'. Can you explain this answer?

Question

During the adsorption of Krypton on activated charcoal at low temperaturea)ΔH < 0 and ΔS < 0b)ΔH > 0 and ΔS < 0c)ΔH > 0 and ΔS > 0d)ΔH < 0 and ΔS > 0Correct answer is option 'A'. Can you explain this answer?

Answer

Generally adsorption is an exothermic process so enthalpy change must be negative and adsorption involves decrease in irregular movement of the molecules so entropy decreases

Answer

Charcoal adsorption beds are commonly used to remove radioactive noble gases from contaminated gas streams. The design of such beds requires the adsorption coefficient for the noble gas. Here an extension of the Dubinin-Radushkevich theory of adsorption is developed to correlate the effects of temperature, pressure, concentration, and carrier gas on the adsorption coefficients of krypton, xenon, and argon on activated carbon. This model is validated with previously published adsorption measurements. It accurately predicts the equilibrium adsorption coefficient at any temperature and pressure if the potential energies of adsorption, the micropore volume, and the van der Waals constants of the gases are known

Answer

Correct answer is option A
During the adsorption of krypton on activated charcoal at low temperature.
ΔH<0 and ΔS<0.
Since adsorption is an exothermic process, the enthalpy change is negative. Heat is given out during the process.
The krypton gas adsorbed on activated charcoal is more ordered than unadsorbed krypton gas. Hence, the process occurs with a decrease in entropy.
In other words, the entropy change is negative for the process.

Answer

Correct answer is option A
During the adsorption of krypton on activated charcoal at low temperature.
ΔH<0 and ΔS<0.
Since adsorption is an exothermic process, the enthalpy change is negative. Heat is given out during the process.
The krypton gas adsorbed on activated charcoal is more ordered than unadsorbed krypton gas. Hence, the process occurs with a decrease in entropy.
In other words, the entropy change is negative for the process.

Answer

The adsorption of Krypton on activated charcoal at low temperatures typically follows the principles of physical adsorption. At low temperatures, the kinetic energy of the Krypton gas molecules is reduced, allowing them to be more easily adsorbed onto the surface of the activated charcoal.

b) The activated charcoal provides a large surface area for the Krypton gas molecules to adsorb onto. The porous structure of the activated charcoal allows for a high degree of surface area, providing ample space for Krypton adsorption.

c) The adsorption of Krypton on activated charcoal at low temperatures is typically reversible. This means that the Krypton gas molecules can be desorbed from the activated charcoal by increasing the temperature or reducing the pressure. This reversibility is advantageous as it allows for the regeneration and reuse of the activated charcoal.

d) The adsorption of Krypton on activated charcoal at low temperatures can be influenced by factors such as the pressure of the Krypton gas, the surface area and pore size distribution of the activated charcoal, and the temperature. Higher pressures of Krypton gas can lead to increased adsorption, while higher temperatures can decrease the adsorption capacity.

e) The adsorption of Krypton on activated charcoal at low temperatures can be used for various applications, such as gas separation, gas storage, and gas purification. Activated charcoal is commonly used in gas masks and air filters to remove harmful gases, including Krypton, from the air.

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