JEE Advanced 2013 · Paper 1 · Chemistry Q23

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ChemistrySingle correct+2Question 23 of 60

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 is accompanied by a decrease in enthalpy.

The adsorption increases with increase of temperature.

The adsorption is irreversible.

Answer and worked solution

Official answer: B

Physisorption. Adsorption of methylene blue on charcoal is physical adsorption: exothermic (ΔH < 0), needs no activation energy, decreases with temperature and is reversible.

(B)

Topics:Adsorption

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JEE Advanced 2013 · Paper 1, Chemistry question 23