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why does a piece of iron get rusted if left exposed in the open?

why does a piece of iron get rusted if left exposed in the open?
sarala
Category: General Reference

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The overall chemical equation for the formation of rust is

Iron + water + oxygen = rust

4 Fe(s) + 6 H2O(l) + 3 O2(g) = 4 Fe(OH)3(s)

Iron(III) hydroxide, Fe(OH)3 then dehydrates to produce Fe2O3.nH2O(s) or rust
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Arun Selvan

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The Oxygen in the air reacts with iron that leads to rusting.

 

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rambabu

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Oxidation is the main reason it gets rusted when it comes in contact with oxygen and moisture present in the atmosphere.
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Sanjeev Gupta

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Iron got rusted because it is exposed to water and oxygen. When iron, water and oxygen combine, it will rust.
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Bol Bachchan

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damp air
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Aakash Agarwal

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Due to dampness in the air .When iron and water drops in air react it get rust.
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PREM LATA

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Not in open but at every place of moisture iron piece will get rusted.
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anil

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Iron reacts to the dampness in the air which form rust on the parts
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sreevani

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As it exposes to oxygen in the air and creates oxidation which is the cause for rust.
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Sasikanth

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See Sarala the reason behind this is that the oxygen of the air reacts with the iron forming a compound called iron oxide. That's why we paint iron to prevent it from rusting or coming in contact with oxygen of the air. Hope this answer helps you.
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ajay

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rust is iron oxide which is formed when iron is exposed to moisture and air
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arjun sai

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Oxidation is main reason of rusting. The moisture present in atmosphere cause the rusting in this case.
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suni51
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