NDA General Ability Question (2025) — Solution

Step-by-step solution

A chemical change involves the formation of one or more new substances with different chemical properties. Burning of coal is a combustion reaction, which is a chemical change. Rusting of metal is an oxidation reaction, which is a chemical change. Reaction of an acid with a base is a neutralization reaction, which is a chemical change. Melting of ice is a change of state from solid to liquid. The chemical composition of water remains the same (H_2O). Therefore, it is a physical change and not a chemical change. Answer: Melting of ice