Question

during adsorption the deltaH is negative and the magnitude of negative value​

Answer 1

adsorption the deltaH is negative. when a gas is absorbed on a solid surface , it's movement is restricted leading to a dicrease in the entropy of the gas i. e.,ΔS is negative. now the process to be spontaneous,ΔG should be negative.
ΔG=Δ H-TΔS

"A negative value of ΔS* suggests that the adsorption process involves an associative mechanism. The adsorption leads to order through the formation of an activated complex between the adsorbate and adsorbent. Also a negative value of ΔS* reflects that no significant change occurs in the internal structures of the adsorbent during the adsorption process