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Topic: Which substance cannot reduce iron (III) oxide to iron?  (Read 6086 times)

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Offline rickyponting66

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Which substance cannot reduce iron (III) oxide to iron?
« on: April 25, 2011, 04:53:23 PM »
Which substance cannot reduce iron (III) oxide to iron?
a) Carbon dioxide
b) Carbon monoxide
c) Coke (carbon)
d) Hydrogen

Offline SirRoderick

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Re: Which substance cannot reduce iron (III) oxide to iron?
« Reply #1 on: April 25, 2011, 05:25:56 PM »
Kind of odd you would post a multiple choice question, but hey.

Carbon, Carbon monoxide and Hydrogen I believe can reduce Iron(III) to Iron. So then the awnser would be CO2. I'm not looking at the tables right now, but if memory serves that should be correct.

Offline DevaDevil

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Re: Which substance cannot reduce iron (III) oxide to iron?
« Reply #2 on: April 26, 2011, 05:07:15 PM »
a substance which can reduce iron (III) has to be oxidized itself of course. So this question can also be read as: which compound can be oxidised?

you will see that carbon dioxide has carbon in its fully-oxidised 4+ state and cannot oxidise further, therefore it cannot reduce iron (III)

Offline SirRoderick

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Re: Which substance cannot reduce iron (III) oxide to iron?
« Reply #3 on: April 26, 2011, 06:30:53 PM »
a substance which can reduce iron (III) has to be oxidized itself of course. So this question can also be read as: which compound can be oxidised?

you will see that carbon dioxide has carbon in its fully-oxidised 4+ state and cannot oxidise further, therefore it cannot reduce iron (III)

Should have thought of that actually, good way to rule it out. Still, memory did serve!

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