SSC
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Yes
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No
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Either A or B
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None of the above
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Detailed explanation-1: -Iron(III) oxide (Fe2O3) reacts with aluminium(Al) to form aluminium oxide(Al2O3) and molten iron(Fe). This is a displacement reaction as aluminium displaces iron in iron(III)oxide to form aluminium oxide. Also it is a redox reaction as both oxidation of aluminium and reduction of iron is taking place.
Detailed explanation-2: -Aluminium is much more reactive than iron because its standard reduction potential is higher than iron.
Detailed explanation-3: -Iron, on the other hand, forms a permeable oxide layer which allows both water and oxygen to pass through and keep attacking the underlying iron. The impervious aluminium oxide layer protects the aluminium from further corrosion whereas the rust on the iron flakes off, exposing more metal iron to attack.