Which of the following is less than zero during adsorption?

Which of the following is less than sero during adsorption?

Which of the following is less than zero for ideal solutions ?

Which of the following is less than zero for ideal solutions ?

Which of the following is less than zero for ideal solutions ?

Which of the following does not occur during adsorption of a gaseous reactant in presence of solid catalyst-

Diploe moment of which of the following is greater than zero ?