The partial pressure of each constituent present in an alloy is __________ the total vapor pressure exerted by the alloy.

ANS:A - less than

The partial pressure of each constituent present in an alloy is less than the total vapor pressure exerted by the alloy. This statement reflects Raoult's law, which states that the partial pressure of each component in an ideal solution (or alloy, in this case) is directly proportional to its mole fraction in the solution and the vapor pressure of the pure component. Since an alloy is a mixture, the mole fraction of each constituent is less than 1, which means the partial pressure of each constituent is less than the vapor pressure of the pure component.