Explain the process of formation of iron oxide . Can you name this process of oxidation? Suggest measures how this can be prevented ? [5 MARKS]

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Explanation: 1 Mark
Naming: 1 Mark

Explanation : 1 Mark
Naming: 1 Mark
Suggestion: 3 Marks

When a piece of iron is left in the open for some time, it acquires a brownish film. This is the formation of Iron oxide,that is when iron combines with free oxygen in the presence of moisture in the air. This process is commonly known as rusting known as rusting.

$I r o n (F e) + O x y g e n (O_{2}, f r o m t h e a i r) + w a t e r (H_{2} O) \to R u s t (i r o n o x i d e) (F e_{2} O_{3} . H_{2} O) B o t h O x y g e n a n d w a t e r o r a r e e s s e n t i a l f o r t h e p r o c e s s o f r u s t i n g .$

We can prevent rusting by following methods:

By painting or greasing: - by applying a coat of paint or grease regularly on iron articles .

By galvanizing: - Depositing a layer of zinc or chromium on iron. The process is known as galvanization.

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