Question

You feel cool when you touch a piece of ice give reason

Answer 1

that is because of thermal equilibrium

when you touch the ice the heat from your hand will be transformed into ice then ice and your hand will attain same O° of temperature that's why you feel cool.

Answer 2

When we touch ice we feel cold because of the melting and evaporation of the ice. When we touch the ice the ice quickly absorbs the heat of our hand,melts and evaporates with the heat. So we feel cold when we touch ice.