JEE Main 2016 · 9 Apr · Shift 1 · Chemistry Q40

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ChemistrySingle correct+4 / -1Question 40 of 90

A particular adsorption process has the following characteristics : (i) It arises due to van der Waals forces and (ii) it is reversible. Identify the correct statement that describes the above adsorption process :

Enthalpy of adsorption is greater than 100 kJ mol

^{-1}

Energy of activation is low.

Adsorption is monolayer.

Adsorption increases with increase in temperature.

Answer and worked solution

Official answer: B

van der Waals forces and reversibility mean physisorption: low enthalpy (about 20-40 kJ mol⁻¹), low activation energy, multilayer, decreasing with temperature. Only (2) fits.

Topics:Adsorption

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JEE Main 2016 · 9 Apr · Shift 1, Chemistry question 40