when we add 3 with O2 then it will be 6 on both sides.
When we add 3 with O2 then it will be 6 on both sides.And this is your answer to this problem.
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In short, Your Answer would be Option C) 3
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Answer is: the value of x is 3.
Chemical reaction: Fe + O₂ → Fe₂O₃.
Oxidation half reaction: Fe⁰ → Fe⁺³ + 3e⁻ /×4; 4Fe⁰ → 4Fe⁺³ + 12e⁻.
Reduction half reaction: O₂⁰+ 4e⁻ → 2O⁻²/×3; 3O₂⁰+ 12e⁻ → 6O⁻².
Balanced chemical reaction: 4Fe + 3O₂ → 2Fe₂O₃.
Oxidation is increase of oxidation number, iron is oxidized from oxidation number 0 (Fe) to oxidation number +3 (in rust Fe₂O₃).
The value of x will be " 3 ".
The iron reacts with moist air and leads to formation of reddish brown layer on its surface that is rust .
It is corrosion but in case of iron is called as "rust ".
The conditions necessary for rusting is :Moisture Air
When iron comes in contact with moist air rusting occurs .
The chemical formula of rust is ; Fe₂O₃.x H₂O
The overall reaction can be represented as :
4 Fe + xO₂-->2 Fe₂O₃
we also know that , mass in any chemical reaction cant be created nor be destroyed ,it remains conserved .So,in accordance with Law of conservation of mass we balance the equation .
Therefore , to balance oxygen we need to multiply it with 3 so as to equalize 6 moles on both sides .
4Fe + 3O₂ > 2Fe₂O₃
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