An iron ring is heated. Which of the following is incorrect?

When we heat a solid, its temperature increases, which increases the thermal energy of the molecules. As a result, the amplitude of vibrations increases. When the amplitude of vibrations increases the mean spacing between the molecules also increases. As a result, the solid expands. Hence, the Iron ring expands on heating.

Cooling a solid decreases the motion of the atoms. A decrease in the motion of the atoms allows the attraction between atoms to bring them a little close together. As a result, solid contracts. Hence, the iron ring almost comes to the same size on cooling.

The change is reversible in the case of the iron ring, it expands on heating and comes back to its original size on cooling.

Hence, the 'The ring changes its shape and change cannot be reversed'  statement is incorrect.