Q6. An example of rusting of iron is-
(a) physical and undesirable change
(b) chemical and fast change
(c) chemical and undesirable change
(d) physical and desirable change
Answers
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Answer:
Rust is clearly a substance that is different from iron. Rusting is an example of a chemical change. ... However, unlike physical properties, chemical properties can only be observed as the substance is in the process of being changed into a different substance. A chemical change is also called a chemical reaction
Explanation:
Rusting of iron is an example of a redox reaction. During rusting, iron combines with oxygen in the presence of water. This is an oxidation reaction where oxygen acts as an oxidising agent. Since oxygen also combines with the metal iron, this is a reduction reaction, where the metal iron acts as a reducing agent.
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Answer:
(c) Rusting of iron is a chemical change because a new substance iron oxide is formed. The presence of oxygen and water or water vapour is essential for rusting.
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