Give the equation for the formation of rust.

One Line Answer

4Fe + 3O₂ + xH₂O → 2Fe₂O₃. xH₂O (Rust).

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Chapter 8 Periodic Classification of Elements
Evaluation | Q VI. 3. | Page 122

What is the corrosion of iron known as?

Name two metals which resist corrosion due to the formation of a thin, hard and impervious layer of oxide on their surface.

Explain why, the galvanised iron article is protected against rusting even if the zinc layer is broken.

Corrosion can be an advantage in some case.Explain ?

Write scientific reasons.

Lemon or tamarind is used for cleaning copper vessels turned greenish.

Give a reason why rust turns moist red litmus blue.

Write scientific reason.

Coins are made from metals and alloys.

Observe the following figure and write the answer of the question.

The diagram shows the reaction between metal and dil. acid.

What is the reason for different behaviour of Mg in test tube B?

Iron pillar near the Qutub Minar in Delhi is famous for the following facts. Which of these facts is responsible for its long stability?