Why is a saturated NaCl solution an example of an equilibrium system? A. Because of the reversible nature of solidifying and melting B. Because of the reversible nature of crystallizing and dissolving C. Because of the reversible nature of evaporating and condensing D. Because of the reversible nature of crystal structure and bond energy

Option B, Because of the reversible nature of crystallizing and dissolving

Explanation:

Solution containing the maximum amount of solute that can be dissolved in the given solvent at the particular temperature is called saturated solution.

Reversible reaction is the reaction which can go in reverse and forward direction both on varying reaction condition.

In the saturated NaCl solution, on lowering temperature, The the dissolved NaCl molecules may crystallize. Likewise on increasing temperature, the crystallized crystals may dissolved. As the reaction moves in both the direction, therefore its considered to be equilibrium system.

Therefore, amog given, option B is correct.

Because of the reversible nature of crystallizing and dissolving

a polar bond is formed when electrons are shared unevenly between atoms

there is none because earth is stationary and flat.