Problem

Why is the formation of slag useful during the sm…

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Problem 8 Medium Difficulty

The following reactions all occur in a blast furnace. Which of these are redox reactions?
(a) $3 \mathrm{Fe}_{2} \mathrm{O}_{3}(s)+\mathrm{CO}(g) \rightarrow 2 \mathrm{Fe}_{3} \mathrm{O}_{4}(s)+\mathrm{CO}_{2}(g)$
(b) $\mathrm{Fe}_{3} \mathrm{O}_{4}(s)+\mathrm{CO}(g) \rightarrow 3 \mathrm{FeO}(s)+\mathrm{CO}_{2}(g)$
(c) $\mathrm{FeO}(s)+\mathrm{CO}(g) \longrightarrow \mathrm{Fe}(l)+\mathrm{CO}_{2}(g)$
(d) $\mathrm{C}(s)+\mathrm{O}_{2}(g) \longrightarrow \mathrm{CO}_{2}(g)$
(e) $\mathrm{C}(s)+\mathrm{CO}_{2}(g) \longrightarrow 2 \mathrm{CO}(g)$
(f) $\mathrm{CaCO}_{3}(s) \rightarrow \mathrm{CaO}(s)+\mathrm{CO}_{2}(g)$
(g) $\mathrm{CaO}(s)+\mathrm{SiO}_{2}(s) \longrightarrow \mathrm{CaSiO}_{3}(l)$

Answer

a) it is redox reaction.
b) it is redox reaction
c) it is redox reaction.
d) Consider the following reaction,
$\mathrm{C}(s)+\mathrm{O}_{2}(g) \rightarrow \mathrm{CO}_{2}(g)$
In this reaction, the oxidation state of oxygen changes from 0 to $-2$ and that of carbon changes
from $0 \mathrm{to}+4 .$ Thus oxygen is reduced and carbon is oxidized. Thus, it is a redox reaction.
e) this is a redox reaction.
f) Consider the following reaction,
$\mathrm{CaCO}_{3}(s) \rightarrow \operatorname{CaO}(s)+\mathrm{CO}_{2}(g)$
In this raaction any of the atoms is neither oxidized nor reduced Hence, this is a not a redox
reaction.
g) Consider the following reaction,
$\mathrm{CaO}(s)+\mathrm{SiO}_{2}(s) \rightarrow \mathrm{CaSiO}_{3}(l)$
In this reaction any of the atoms is neither oxidized nor reduced. Hence, this is a not a redox
reaction.

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Chapter 19

Transition Metals and Coordination Chemistry

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Video Transcript

Okay, So re tox reaction happens. One's ears air changed in the oxidation state off element within the reaction. So from these rules, we can take a look at each reaction formula individually and did her mind if they are Redox reaction or not, it's always, um from the question, eh? Sorry, f e 203 plus carbon monoxide. Well generates F He's three or four plus sealed too. So here for the f E 203 Generally oxygen will have negative too oxidation state. Thus the f you here well have plus three oxidation state and the oxygen here also well have negative to also daisy and state on the cover in here will have positive to oxidation state. However, in f e three 04 The oxygen's thing has nothing to oxidation state, however, is it f you hear some awesome well have positive three boxer vision state, but some of them will have plus two oxidation state un for the carbon dioxide again oxygen have negative to oxidation state. However, carbon here have positive for oxidation state because there are two oxygen now in covering the oxide. So from here we can see that the oxidation state off carbon changes in the reaction on the oxidation state off the iron also changes tweeting the reaction. So because all that it is a readout reaction. Okay, four b, as I have mentioned before the iron here, Some of them have the plaice to oxidation state. Some has plus three oxidation states on the carbon here is positive too. Oxidation state on however, for f e o. Because off the molar, a showoff iron and oxygen are 1 to 1. So the iron here has positive too Oxidation state. Well, the oxygen has negative to oxidation. State on the cover here again has positive four oxidation state is in covering the oxide. So again, in this reaction, the oxidation state off iron changes from plus three two plus two on the cover oxidation state also changes from class to class for so it is a re docks reaction as well. Okay. And now let's look at reaction. See iron oxide, as I have mentioned in B, the Iran has plus two oxidation states on the carbon here also has plus toe oxidation state. However, for elemental iron, the oxidation state will be zero on before covering the outside so carbon is class form. So again, we all deserve oxidation. State change for both. The item decreasing from plus 2 to 0 on the exhibition stayed off carbon increase. It's from class to class form. So again, these reaction is a redox reaction. Okay, for the we can tell that all elements is all compounds in his elemental form have zero oxidation state. However, for covering the oxide, the carbon get oxidized in cool plus four state on also Jin get reduced to an active too oxidation state. So again, this is a very obvious Redox reaction. Okay for you again, carbon star with zero on the carpet in the current dogs I start with plus four However, we'll cover monoxide. The carbon is in class to oxidation state. So again, because off the oxidation state change if he is a redox reaction okay on for this one. We know that because of Seo three has minus two oxidation states. It's also calcium here has plus two oxidation state on the carbon has class for on oxygen has negative too On here in the product, the calcium retains its positive to oxidation state while the oxygen is negative too. Uncovering the oxide carbon has posted for on oxygen have negative too. So here we see no change in oxidation state off any element within the rear doctrine. So it is not a re DOS reaction kid for the last one caught calcium oxide oxygen has an active to oxidation state. So calcium has plus two on silicon has plus four on here. The council remains will be plus two. Well, silicon remains to be plus for so it is also not Redox reaction.

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