Allied solutions

Allied solutions

Grade 7

Metals and Non-Metals | Exercise

Question 11

Q11) Explain the term - rusting and give a word equation for the formation of rust. If polished iron nails are kept in three separate test tubes, state the contents in each test tube required, to prove conditions for rusting.

Solution :

Slow oxidation of iron in presence of air and moisture with formation of hydrated iron [[III]] oxide is called rusting.

Iron + Oxygen → Iron Oxide → Rust hydrated iron [[III]] oxide

4Fe+3O_2→2Fe_2O_3→Fe_2O_3\times H_2O

The oxygen in the air reacts with iron and presence of moisture forms a brown coating called rust. It corrodes iron and reduces its structural strength.

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subject-cta

Question 11

Q11) Explain the term - rusting and give a word equation for the formation of rust. If polished iron nails are kept in three separate test tubes, state the contents in each test tube required, to prove conditions for rusting.

Solution :

Slow oxidation of iron in presence of air and moisture with formation of hydrated iron [[III]] oxide is called rusting.

Iron + Oxygen → Iron Oxide → Rust hydrated iron [[III]] oxide

4Fe+3O_2→2Fe_2O_3→Fe_2O_3\times H_2O

The oxygen in the air reacts with iron and presence of moisture forms a brown coating called rust. It corrodes iron and reduces its structural strength.

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subject-cta
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