Moisten two pieces of paper, one with water and the other with vegetable oil. Will they stick together? Justify the answer.

If you pour oil into water, then it will not dissolve in it, but will float in some particles. Vegetable oil does not mix with water because fats will repel water.
The sheets will not stick together due to the fact that the intermolecular interaction of water molecules will be stronger than that of fat molecules.
To check, you can dip your hand in vegetable oil, and then dip it into water. The hand will remain dry. This phenomenon is explained in the same way as in the case of leaves.