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Methylene blue, from its aqueous solution, is adsorbed on activated charcoal at 25°C. For this process, the correct statement is:
- a)The adsorption requires activation at 25°C
- b)The adsorption is accompanied by a decrease in enthalpy
- c)The adsorption increase with increase of temperature
- d)The adsorption is irreversible
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
Methylene blue, from its aqueous solution, is adsorbed on activated ch...
Adsorption of methylene blue on activated charcoal is physical adsorption hence it is characterised by
decrease in enthalpy. Hence (B) is correct
Most Upvoted Answer
Methylene blue, from its aqueous solution, is adsorbed on activated ch...
Explanation:
Methylene blue is a cationic dye and is adsorbed on activated charcoal through electrostatic interactions between the positive charge of the dye molecule and the negative charge of the charcoal surface. The process of adsorption of methylene blue from its aqueous solution onto activated charcoal at 25°C can be analyzed using the given options.
a) The adsorption requires activation at 25°C:
This statement is not correct. Activated charcoal is already prepared by a process called activation, which involves heating the charcoal to high temperatures to create a highly porous structure. This activation process is not required during the adsorption of methylene blue onto activated charcoal at 25°C.
b) The adsorption is accompanied by a decrease in enthalpy:
This statement is correct. Adsorption is an exothermic process, meaning it releases heat. When methylene blue is adsorbed onto activated charcoal, the interactions between the dye and the surface of the charcoal result in a decrease in enthalpy. This decrease in enthalpy can be explained by the energy released when the dye molecules come into contact with the charcoal surface and form electrostatic interactions.
c) The adsorption increases with an increase in temperature:
This statement is not correct. Generally, the adsorption of a solute onto an adsorbent decreases with an increase in temperature. This is because higher temperatures provide more energy to the system, allowing the solute molecules to overcome the attractive forces of the adsorbent and desorb from the surface. Therefore, the adsorption of methylene blue onto activated charcoal is expected to decrease with an increase in temperature.
d) The adsorption is irreversible:
This statement is not provided in the given information. The reversibility of adsorption depends on various factors such as the nature of the adsorbent and the adsorbate, temperature, and the presence of other solutes. Without additional information, it is not possible to determine whether the adsorption of methylene blue onto activated charcoal is reversible or irreversible.
Methylene blue is a cationic dye and is adsorbed on activated charcoal through electrostatic interactions between the positive charge of the dye molecule and the negative charge of the charcoal surface. The process of adsorption of methylene blue from its aqueous solution onto activated charcoal at 25°C can be analyzed using the given options.
a) The adsorption requires activation at 25°C:
This statement is not correct. Activated charcoal is already prepared by a process called activation, which involves heating the charcoal to high temperatures to create a highly porous structure. This activation process is not required during the adsorption of methylene blue onto activated charcoal at 25°C.
b) The adsorption is accompanied by a decrease in enthalpy:
This statement is correct. Adsorption is an exothermic process, meaning it releases heat. When methylene blue is adsorbed onto activated charcoal, the interactions between the dye and the surface of the charcoal result in a decrease in enthalpy. This decrease in enthalpy can be explained by the energy released when the dye molecules come into contact with the charcoal surface and form electrostatic interactions.
c) The adsorption increases with an increase in temperature:
This statement is not correct. Generally, the adsorption of a solute onto an adsorbent decreases with an increase in temperature. This is because higher temperatures provide more energy to the system, allowing the solute molecules to overcome the attractive forces of the adsorbent and desorb from the surface. Therefore, the adsorption of methylene blue onto activated charcoal is expected to decrease with an increase in temperature.
d) The adsorption is irreversible:
This statement is not provided in the given information. The reversibility of adsorption depends on various factors such as the nature of the adsorbent and the adsorbate, temperature, and the presence of other solutes. Without additional information, it is not possible to determine whether the adsorption of methylene blue onto activated charcoal is reversible or irreversible.
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Methylene blue, from its aqueous solution, is adsorbed on activated charcoal at 25°C. For this process, the correct statement is:a)The adsorption requires activation at 25°Cb)The adsorption is accompanied by a decrease in enthalpyc)The adsorption increase with increase of temperatured)The adsorption is irreversibleCorrect answer is option 'B'. Can you explain this answer?
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Methylene blue, from its aqueous solution, is adsorbed on activated charcoal at 25°C. For this process, the correct statement is:a)The adsorption requires activation at 25°Cb)The adsorption is accompanied by a decrease in enthalpyc)The adsorption increase with increase of temperatured)The adsorption is irreversibleCorrect answer is option 'B'. Can you explain this answer? for Chemistry 2024 is part of Chemistry preparation. The Question and answers have been prepared according to the Chemistry exam syllabus. Information about Methylene blue, from its aqueous solution, is adsorbed on activated charcoal at 25°C. For this process, the correct statement is:a)The adsorption requires activation at 25°Cb)The adsorption is accompanied by a decrease in enthalpyc)The adsorption increase with increase of temperatured)The adsorption is irreversibleCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Chemistry 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Methylene blue, from its aqueous solution, is adsorbed on activated charcoal at 25°C. For this process, the correct statement is:a)The adsorption requires activation at 25°Cb)The adsorption is accompanied by a decrease in enthalpyc)The adsorption increase with increase of temperatured)The adsorption is irreversibleCorrect answer is option 'B'. Can you explain this answer?.
Methylene blue, from its aqueous solution, is adsorbed on activated charcoal at 25°C. For this process, the correct statement is:a)The adsorption requires activation at 25°Cb)The adsorption is accompanied by a decrease in enthalpyc)The adsorption increase with increase of temperatured)The adsorption is irreversibleCorrect answer is option 'B'. Can you explain this answer? for Chemistry 2024 is part of Chemistry preparation. The Question and answers have been prepared according to the Chemistry exam syllabus. Information about Methylene blue, from its aqueous solution, is adsorbed on activated charcoal at 25°C. For this process, the correct statement is:a)The adsorption requires activation at 25°Cb)The adsorption is accompanied by a decrease in enthalpyc)The adsorption increase with increase of temperatured)The adsorption is irreversibleCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Chemistry 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Methylene blue, from its aqueous solution, is adsorbed on activated charcoal at 25°C. For this process, the correct statement is:a)The adsorption requires activation at 25°Cb)The adsorption is accompanied by a decrease in enthalpyc)The adsorption increase with increase of temperatured)The adsorption is irreversibleCorrect answer is option 'B'. Can you explain this answer?.
Solutions for Methylene blue, from its aqueous solution, is adsorbed on activated charcoal at 25°C. For this process, the correct statement is:a)The adsorption requires activation at 25°Cb)The adsorption is accompanied by a decrease in enthalpyc)The adsorption increase with increase of temperatured)The adsorption is irreversibleCorrect answer is option 'B'. Can you explain this answer? in English & in Hindi are available as part of our courses for Chemistry.
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