What is the best description of osmosis?

random movement of oxygen molecules across a concentration gradient until the number of molecules is nearly equal

movement of molecules from areas of higher concentration to areas of lower concentration

movement of water from an area of lower solute concentration to an area of higher solute concentration

net movement of molecules across the nuclear membrane until the number of molecules on each side is nearly equal

Net movement of molecules across the nuclear membrane until the number of molecules on each side is nearly equal

Explanation:

The net spontaneous movement of the molecules of a solvent  through the selective membrane to an area of higher concentration of the solvent is the process of Osmosis.  

By this process in a solvent separates the 2 solutions of various concentrations. The pressure through which the movements were initiated is the ‘osmotic pressure’. The membrane should be permeable for molecule movements.

The correct answer is (b) The water has a lower boiling point than salt.

The separation of salt from water is carried out by the process of distillation. The boiling point of water is lower than that of salt so the water converts into steam on heating and the salt remains in the vessel. When salt is mixed in water, there occurs a phenomenon called elevation in boiling point of water but the change is very less as it cannot be observed. Even if there is a elevation in boiling point of the water it is lower as compared to the boiling point of salt.