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Which of the following is the correct reason to justify that rusting of iron is a chemical change?

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A new substance is formed

Rust is totally different from iron

Iron is an element while rust is a hydrated oxide of iron

All the above

answer is D.

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Detailed Solution

All of the above options are correct reasons to justify that rusting of iron is a chemical change.

In a chemical change, a new substance is formed, and rust is totally different from iron. Iron is an element while rust is the hydrated oxide of iron (Fe

. xH

O). Thus, the formation of rust is a chemical change.

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