ANS:B - 1 Nm³ of dry air is lighter than 1Nm³ of humid air.

The wrong statement is: "An azeotropic mixture of two liquids has a boiling point higher than either of them when it shows negative deviation from Raoult's Law." In fact, an azeotropic mixture of two liquids exhibits a boiling point lower than either of the pure components, regardless of whether it shows positive or negative deviation from Raoult's Law. This is a characteristic feature of azeotropic mixtures. Azeotropic mixtures form at certain compositions where the vapor pressure of the mixture is higher (or lower) than that of the pure components, resulting in a boiling point different from those of the pure components. For example, in a positive deviation from Raoult's Law, the vapor pressure of the mixture is higher than expected, leading to a lower boiling point than that of either pure component. Conversely, in a negative deviation from Raoult's Law, the vapor pressure of the mixture is lower than expected, also resulting in a lower boiling point than that of either pure component. Therefore, the correct statement would be: "An azeotropic mixture of two liquids has a boiling point lower than either of them when it shows negative deviation from Raoult's Law."