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Which of the following is an example of a chemical change?
Melting of ice
Sublimation of camphor
Rusting of iron
Evaporation of water
Rusting of iron
A chemical change involves the formation of a new substance with different chemical properties through a chemical reaction. Rusting of iron is a chemical change where iron reacts with oxygen and moisture to form iron oxide (hydrated ferric oxide).
A chemical change involves the formation of a new substance with different chemical properties through a chemical reaction. Rusting of iron is a chemical change where iron reacts with oxygen and moisture to form iron oxide (hydrated ferric oxide).
Chemical processes in metallurgy are governed by the law of conservation of mass, formulated by Antoine Lavoisier in 1789, a cornerstone of modern chemistry.
Chemical changes are permanent and irreversible, unlike physical changes.
Rusting requires both oxygen and water to occur; it is an oxidation process.
The chemical formula for rust is Fe2O3.xH2O.
Galvanization is the process of coating iron with zinc to prevent rust.
Melting of ice (Option A) is a physical change as it involves only a change in state, not chemical composition.
Sublimation of camphor (Option B) is a physical change where a solid turns directly into a gas without changing its molecular structure.
Evaporation of water (Option D) is a physical process of vaporization occurring at the surface of a liquid.
Chemical changes often involve energy changes, such as the release or absorption of heat.
C is correct тАФ Rusting of iron results in the creation of a new substance called iron oxide, which is a chemical process.
In the Science section of RRB exams, distinguish chemical changes from physical changes by checking if the original substance can be easily recovered; if not, it is usually a chemical change.
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