Why would the solution not be considered to be in equilibrium?

The solvent molecules are not all located on the right side of the container.

The solute molecules are not evenly distributed throughout the solvent.

There are more solvent molecules than solute molecules in the solution.

There is no membrane separating the solution into different parts.

Option B, The solute molecules are not evenly distributed throughout the solvent.

Explanation:

In any solution which is at equilibrium, the amount of solute in a given solvent must be uniform. This implies that the number of solute particle across the semipermeable membrane in the solution within the two chambers must have equal number of solute particles.

In such a system, the solute particle flow from region of high concentration to the region of low concentration till there exists a concentration gradient due to unequal distribution of solute particles.

Hence, option B is correct

C. There are more solvent molecules than solute molecules in the solution.

Explanation:

An equilibrium exist when there is equal distribution of solute and solvent present in a solution otherwise it will be not.

The undistributed solvent and solute concentration undergoes the process of osmosis through which solvent molecules moves from lower to higher concentration through a semipermeable membrane and redistribute the concentration.

The redistribution of molecules reaches the equilibrium, so, until there is more solvent molecules than solute molecules in the solution, there will be no equilibrium.

Hence, the correct option is C.