Negative deviation occurs when the total vapour pressure is less than what it should be according to raoult's law. considering the same a and b components to form a non-ideal solution, it will show negative deviation from raoult's law only when: o a. pia p[ao] times x[a] and p[bi < pibo] x[bi as the total vapour pressure (p[ao] xia] + p[b0] xib]) is less than what it should be with respect to raoult's law. o b. the solute-solvent interaction is stronger than solute-solute and solvent-solvent interaction o c. the enthalpy of mixing is negative because stronger attractions are formed. o d. the volume of mixing is negative becasue stronger attractions have led to a contraction in volume o a and b only o a, b and c only all of the above