Engineering
Chemistry
Electrolytes and Types
Question

Methylene blue, from its aqueous solution, is adsorbed on activated charcoal at 25°C. For this process, the correct statement is :

The adsorption requires activation at 25°C.

The adsorption increases with increase of temperature

The adsorption is irreversible.

The adsorption is accompanied by a decrease in enthalpy

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Solution
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Adsorption is physisorption and hence activation is almost not required. Physisorption is exothermic and reversible and it decreases with increase in temperature.          

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