Which one among the following statements is correct ?

Melting of ice is a physical change because it involves a change of state from solid to liquid without altering the chemical composition of water [t1][t6]. Physical changes are characterized by the absence of new substance formation and are often reversible, as melted ice can be refrozen [c2][c4]. In contrast, the burning of a candle is primarily a chemical change. While the wax melts (physical), the actual burning involves the wax vapor reacting with oxygen (combustion) to produce new substances like carbon dioxide and water vapor [c1][t2][t5]. Chemical changes result in the formation of one or more new substances with different properties [c2][c3]. Therefore, melting ice is a physical change while the burning of a candle is a chemical change, as it transforms the original matter into different chemical products [t3].

Sources

1. [1] Science-Class VII . NCERT(Revised ed 2025) > Chapter 5: Changes Around Us: Physical and Chemical > 5.4 Can Physical and Chemical Changes Occur in the Same Process? > p. 65
2. [2] Science-Class VII . NCERT(Revised ed 2025) > Chapter 5: Changes Around Us: Physical and Chemical > In a Nutshell > p. 68
3. [3] Science-Class VII . NCERT(Revised ed 2025) > Chapter 5: Changes Around Us: Physical and Chemical > 5.3.2 Combustion > p. 62
4. [4] Science-Class VII . NCERT(Revised ed 2025) > Chapter 5: Changes Around Us: Physical and Chemical > 5.5 Are Changes Permanent? > p. 66