The rate of evaporation of liquid does not depend upon

The correct answer is C, its mass. Evaporation is a surface process, so its rate depends on conditions at the surface of the liquid, not on how much liquid there is in total. Molecules at the surface that gain enough energy escape into the air, and evaporation goes on at any temperature below the boiling point, cooling the liquid as it does so. A larger mass of water in the same open dish loses water at the same rate; it only takes longer to dry up completely. Option A is wrong because a higher temperature gives more surface molecules enough energy to escape, so evaporation speeds up, which is why clothes dry faster on a hot day. Option B is wrong because a larger exposed surface area lets more molecules escape at once, which is why tea cools faster in a saucer than in a cup. Option D is wrong because humid air already holds much water vapour and takes up less, so evaporation slows in the rainy season. Exam tip: evaporation rises with temperature, surface area and wind speed and falls with humidity; it causes cooling, as in an earthen pot or sweating.