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.

Both the statements are correct.

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Both the statement are incorrect.

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Only statement I is correct.

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Only statement II is correct.

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Solution

The correct option is A Both the statements are correct.
Corrosion is the gradual degradation of metallic objects in the presence of various substances present in the atmosphere like oxygen, moisture, etc.

On leaving a piece of iron in open it gets corroded. A reddish brown flaky layer (iron oxide) is formed on its surface which is called rust.

Rusting of iron is a chemical change because in this process, a new substance, rust (iron oxide) is formed.

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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.

State whether the following statements are true or false. In case a statement is false, write the corrected statement in your notebook.

(a) Cutting a log of wood into pieces is a chemical change. (True/False)

(b) Formation of manure from leaves is a physical change.

(True/ False)

(d) Iron and rust are the same substances. (True/False)

(e) Condensation of steam is not a chemical change. (True/False)

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. (1)

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?

(2)

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

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

(3)

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

(4)

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

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

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?

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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.

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.