Read the passage given below and answer the following questions:

The dissolution of a gas in a liquid is governed by Henry’s law, according to which, at a given temperature the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas. In a binary solution containing volatile miscible liquid, then we use Raoult’s law which state that p_total = p°_Ax_A+p°_Bx_B

Solutions which obey Raoult’s law over the entire range of concentration are called ideal solutions. Two types of deviations from Raoult’s law, called positive and negative deviations are observed. Azeotropes arise due to very large deviations from Raoult’s law.