Why is rusting of iron termed as a chemical change?

It is a temporary change.

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The original substance can be recovered.

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The shape of iron changes.

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A new substance is formed.

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Solution

The correct option is D
A new substance is formed.

Iron reacts chemically with oxygen and water vapour present in the air and thus rust formation takes place. Rust is iron(ii) oxide, a new substance formed out of the reaction. The colour of the surface of the iron also changes in this reaction. The reaction is as follows:

$4 Fe (s) + 2 O_{2} (g) \to 2 {Fe}_{2} O_{3} (s)$

Hence, rusting of iron is a chemical change.

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Similar questions

Q. Which of the following is not a feature of chemical change?

(I) Original substance can be obtained by simple physical methods.
(II) It is a temporary change.
(III) The new substances formed have properties different from those of the reacting substances.

If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.

(a) Do you think rust is different from iron?

(b) Can you change rust back into iron by some simple method?

(c) Do you think the formation of rust on iron is a chemical change?

(d) Give two other examples of a similar type of change.

Q. Statement I: If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.

Statement II: Rusting of iron is a chemical change.

Q. Fill in the blanks in the following statements:

(a) When carbon dioxide is passed through lime water, it turns milky due to the formation of
(b) The chemical name of baking soda is
(c) Two methods by which rusting of iron can be prevented are and
(d) Changes in which onlyproperties of a substance change are called physical changes.
(e) Changes in which new substances are formed are called changes.

Question 21

If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
(a) Do you think rust is different from iron?
(b) Can you change rust back into iron by some simple method.
(c) Do you think formation of rust from iron is a chemical change?
(d) Give two other examples of a similar type of change.

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