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What is the role of moisture in rusting ...

What is the role of moisture in rusting of iron ?

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(i) Formation of Iron (II) hydroxide
(ii) Composition of rust.
(iii) Comparison of form in which iron is present in pure metal and rust.
(iv) Change undergone by iron during the rusting process.
(v) Requisite for an electrochemical cell.
(vi) Identification of electrode and electrolyte in the prcoess of rusting
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