If a piece of iron gains 10% of its mass due to partial rusting into ferric oxide the percentage of total iron that has rusted is

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Q. If a piece of iron gains

10 %

of its weight due to partial rushing into

F e_{2} O_{3}

the percentage of total iron that has rusted is:

Q. If a piece of iron gains 10% of its weight due to partial rusting into

F e_{2} O_{3}

, the percentage of total iron that has rusted is:

Q. Assertion :Rusting of iron is considered an oxidation reaction. Reason: Rust is another name for iron oxide which occurs when iron is exposed to oxygen and moisture for a long period of time. Overtime the oxygen combines with the metal at atomic level forming a compound called an oxide. Rust forms when iron undergoes oxidation. The main catalyst for the rusting process is water.

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.

Q. Assertion :Zinc is used for galvanising iron. Reason: Rust is hydrated ferric oxide.

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