> 0 (b) 
< 0 (c) 
< 0 (d) < 0
Answer:
(a) For phenomenon of adsorption 
< 0, i.e., enthalpy
change during phenomenon of adsorption is negative because during adsorption,
there is always a decrease in
residual forces of the surface which
lead to decrease in surface energy which appears as heat.
So, adsorption is an exothermic process
and 
.
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