30. Water drops cannot stick to the oily surface due to A.Lack of adhesive force B.Surface tension C.Cannot mix each other D.Water is lighter than oil
Option B Solution: The separation of oil and water is caused due to the difference in surface tension of the two liquids. The water molecules stick together tightly and does not mix with the oil because water molecules are attracted to each other very strongly, forming an invisible “skin” of surface tension around each drop.
