Which of the following is not a physical change?(a) Boiling of water to give water vapour(b) Melting of ice to give water(c) Dissolution of salt in water(d) Combustion of Liquefied Pe

To determine which of the given options is not a physical change, we need to understand the difference between physical and chemical changes.

A physical change refers to a change in the physical properties of a substance, such as its shape, size, or state, without altering its chemical composition. On the other hand, a chemical change involves a transformation at the molecular level, resulting in the formation of new substances with different chemical properties.

Let's analyze each option:

(a) Boiling of water to give water vapor: This is a physical change. When water is heated, it changes from a liquid state to a gaseous state, but its chemical composition remains the same.

(b) Melting of ice to give water: This is also a physical change. When ice is heated, it changes from a solid state to a liquid state, but the chemical composition of water remains unchanged.

(c) Dissolution of salt in water: This is a physical change as well. When salt is dissolved in water, it forms a homogeneous mixture, but the chemical composition of salt and water remains the same.

(d) Combustion of Liquefied Pe: This option is incomplete and unclear. Without further information, it is difficult to determine whether it is a physical or chemical change.

Based on the given options, it is not possible to determine which one is not a physical change.