Which statements are correct? (A) Physical adsorption is multi-layer, non-directional and non-sp...

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Which statements are correct?
(A) Physical adsorption is multi-layer, non-directional and non-specific.
(B) Chemical adsorption attains equilibrium some late
(C) Physical adsorption is due to valence of atoms
(D) Chemical adsorption is more stronger than physical adsorption.
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