Questions tagged [oxidation-state]

Oxidation state is a concept, which assigns hypothetical charges to atoms in compounds. This tag should be applied to questions which relate to that concept or to oxidation states in atoms of compounds.

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What are oxidation numbers of each element in CuH?

My chemistry teacher said hydrogen when bonded with metals has oxidation number (O.N.) of −1 except CuH: in CuH the hydrogen has O.N. +1 and the copper has O.N. −1. But on the internet it is ...
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Variable Oxidation states of Lanthanoids

Electronic Configuration of Cerium (Z=58) is [Xe]4f1 5d1 6s2. So to attain the stability of noble gas Xenon (Z=54) , Cerium has to lose 4 electron to attain noble gas stability . Lanthanoids exhibit ...
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3 votes
3 answers
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Why chlorate(V) is one of the primary products of disproportionation reaction between chlorine gas and hot concentrated NaOH?

Cold diluted $\ce{NaOH}$ reacts with $\ce{Cl2}$ producing hypochlorite: $$\ce{2 NaOH(aq, dil, cold) + Cl2(g) -> NaClO(aq) + NaCl(aq) + H2O(l)},\tag{R1}$$ whereas hot concentrated $\ce{NaOH}$ yields ...
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How is 1 mole hypochlorite ion equivalent to 1 mole chlorine gas?

According to my book, 1 mole ClO- is equivalent to 1 mole Cl2. How is that even possible? 1 mole ClO- contains 1 mole Cl atoms. On the contrary, 1 mole Cl2 gas contains 2 mole Cl atoms. So, how are ...
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Is haloform reaction considered to be disproportionation? [duplicate]

A question in an exam listed a number of compounds and the task was to find the number of compounds which will undergo disproportionation in conc. $\ce{NaOH}$. One of the compounds was $\ce{CCl3CHO}$, ...
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Can halogens show -3 or -5 or -7 oxidation state. Why? [closed]

I mean can we think it like if the electrons get excited into the d orbitals and because there are now more than one unpaired electron, why does it only loose them and why don't they accept more than ...
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Does hypochlorous acid oxidize hydrogen peroxide?

The following reaction is from https://ncert.nic.in/textbook/pdf/kech202.pdf, p. 11: $$\ce{H2O2 + HOCl -> H3O+ + Cl- + O2}$$ I have to find if $\ce{H2O2}$ is acting like a reducing agent or an ...
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Computing the overall charge of a compound with non-integer coefficients

I have a question about computing the overall charge of inorganic chemicals, where the composition is expressed using non-integer stoichiometric coefficients. Let's say we have $\ce{Hg_{0.7}Cd_{0.3}Te}...
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Why doesn't XeF6 displace oxygen from water?

Consider the following reactions (unbalanced): $$ \begin{align} \ce{XeF2 + H2O &→ Xe + HF + O2} \tag{a} \\ \ce{XeF4 + H2O &→ XeO3 + Xe + O2 + HF} \tag{b} \\ \ce{XeF6 + H2O &→ XeO3 + HF} \...
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In Lanthanides, Why is electron removed from 4f before 5p? [duplicate]

I've been taught that electrons are removed first from valence shell electrons with highest energy. But In Lanthanides, for example taking configuration- [Xe]4f⁴6s², If we go to +3 Oxidation State, ...
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Balancing a chemical reaction with oxidation numbers

We have been teached how to balance chemical reactions with oxidation numbers in school, but somehow I can't understand it. This is the equation to balance $$\ce{Cu(s) + NO3−(aq) + H+(aq) -> Cu^2+(...
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In the complete combustion of methane, is it methane or carbon that is oxidised?

I realise this is a rather pedantic question, but I'm wondering which application of terminology is more correct here. I know that, in the complete combustion of methane, methane is the reducing agent....
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Do molecules containing enough oxygen to burn themselves exist?

Is there a molecule with enough oxygen in it (for example, something like $\ce{HCOOOH}$) such that it can undergo complete combustion without requiring any additional oxygen? For example the above ...
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Will strong base corrode aluminium in absence of oxygen? [closed]

From what i understand, putting iron in a vacuum chamber (airtight container) will stops further oxidation take place. However in aluminium, with only oxygen, aluminium will form thin oxide film that ...
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Why are group 13 compounds in the +1 oxidation state more ionic than those in the +3 oxidation state?

I know that for group 13 metals in the p block, the stability of +1 OS is generally more than the stability of +3 OS as it is energetically not favourable to attain the higher OS of +3 and such ions ...
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2 votes
2 answers
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Oxidation of sulfuric acid to Marshall's acid and its half cell reaction

$\ce{H2O2}$ can be prepared by successive reactions: $\ce{2NH4HSO4 -> H2 + (NH4)2S2O8}$ $\ce{(NH4)2S2O8 + 2H2O -> 2NH4HSO4 + H2O2}$ The first reaction is an electrolytic reaction and second is ...
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How can one change the color of Iron Oxide by changing the composition or hydration?

How does the color of rust change depending on its makeup and state, or more to the point, how would one put the rust into that state? For example, Wikipedia shows Iron(III) Oxide as being red in the ...
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What are the safest non-toxic elements I can own? [closed]

As in a recent question, I mentioned I collect elements. My collection already has quite a few elements and a rare alloy (I have silicon, molybdenum, tungsten, gold, platinum, silver, copper, ...
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13 votes
4 answers
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Can osmium react with oxygen at room temperature?

I’m an avid collector of elements (I love shiny rocks - don’t judge). I’m looking to buy some osmium, as it’s one of the heaviest and hardest metals out there. However, people online told me to avoid ...
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5 votes
1 answer
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Oxidation number of methylene blue

I came across methylene blue's structure when it reacts with oxygen. The left is the reduced state, and the right is the oxidized state. However, when I looked at them carefully, the oxidation number ...
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The oxidation number of N and Cl in NOClO4 ​

My doubt is not about the solution itself, actually I was able to find the solution myself. We could split NOClO4 as (NO+) + (ClO4-) and then proceed, but here I "knew" this split. Is there ...
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Is Co(2+) easily oxidised to Co(3+)? [closed]

I think this question lacks some required informations but that's exactly what was given on my question paper. I thought of explaining this in descriptions of crystal field theory but I couldn't solve ...
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What exactly is oxidation number with regards to [Fe(CN)6]-4 [closed]

I read that $\ce{Fe}$ has an oxidation state of $+2$ in $\ce{[Fe(CN)6]^{4-}}$. Does that mean $\ce{Fe}$ gives away $2$ electrons? Doesn't $\ce{(CN)6}$ form coordination bonds with $\ce{Fe}$ meaning $\...
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-1 votes
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What are compounds where oxygen has oxidation state -1/3 called?

I have heard of oxides, peroxides and superoxides where oxygen oxidation number is $-2, -1, -\frac{1}{2}$ respectively. But I came across a molecule with the formula $\ce{KO_3}$, oxygen has $-\frac{1}{...
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How do I balance a hydrogen peroxide redox equation? [closed]

I have this equation: $$\ce{H2O2 + MnO4- + H+ -> O2 + Mn^2+ + H2O}.$$ How do I balance it, since O has two different oxidation states on one side?
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1 vote
1 answer
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Why does mercury(II) nitrate form only when using concentrated nitric acid?

In the reaction between mercury and nitric acid, mercury(II) nitrate only forms when concentrated nitric acid is heated up and added to it, if the acid is dilute, mercury(I) nitrate forms. I ...
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Why sodium metabisulphite is not an oxidising agent? [closed]

We know that the maximum possible oxidation state of sulphur is $+6$. Whereas the oxidation states of sulphur in sodium metabisulphite are $+3$ and $+5$. Can't these oxidation states reduces to a ...
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Does boron exhibit +1 oxidation state?

My teacher told that boron exhibits only a $+3$ oxidation state, but he also wrote the unbalanced reaction $$\ce{B + C -> B4C}.$$ Carbon has greater electronegativity than boron leaving us with $\...
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Apparent inversion of oxidation state of sulfate ion using minimal basis set

It is well known that the sulfate ion has essentially no 3d-2p bonding; hence I used the minimal basis set(STO-3G) for the NBO calculation I did via Gaussian, just to check it. However, I got a ...
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1 vote
1 answer
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Balancing disproportionation reaction of hypoiodous acid

In aqueous solution, the acid $\ce{HIO}$ disproportionates according to the following equation where m, n, p and q are simple whole numbers in their lowest ratios. $$\ce{mHIO → nI2 + pHIO3 + qH2O}$$ ...
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-1 votes
1 answer
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How To Know Which Oxidation Number To Use For Nitrogen [duplicate]

When given a compound like (NH4)2MoO4 and asked to find the oxidation number of Mo, how do I know which oxidation number to sub in for Nitrogen? On the periodic table, Nitrogen has oxidation numbers ...
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Why does CO2 have a greater affinity for hemoglobin than oxygen?

I know about CO but I am wondering if CO2 has similar mechanism? do you guys have any scientific reference These species help form interactions between amino-acid residues at the interfaces of the ...
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what happens if iron clamp is attached to a copper pipe to a wall? [closed]

I'm guessing its not a good idea, since iron will then corrode easily (also depending on the location and environment), Although copper do not rust it will increase the rate of it from oxidizing. plus ...
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5 votes
1 answer
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What is/was "uraneous oxide"? Was it an accepted name for a compound or mixed oxides of uranium?

In This National Technical Reports Library page for a 1965 report Method for Coating Actinide Particles in the list of keywords both Uranium compounds and Uraneous oxide are listed. But I don't find ...
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7 votes
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Can ozone oxidise iodine to periodic acid?

I noticed that the reaction of ozone with $\ce{I_2}$ gives iodic acid and not periodic acid. Upon searching, I found this question: Why does iodine get oxidized to iodic acid and not periodic acid by ...
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Why does one drain strainer rust while the other does not?

About a month back, I acquired drain strainers for my shower and kitchen sink. The package I got included one of each, which I installed immediately. Within two weeks, the shower strainer was showing ...
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3 votes
1 answer
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How can I prove ascorbic acid degradation with Uv-vis spectroscopy?

I have to prove scientifically why a sodium ascorbate solution in water turns yellowish - reddish over time. I know ascorbic acid is supposed to oxidize into dehydroascorbic acid, and the latter then ...
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Does lead carry the negative charge in plumbane?

It says in Wikipedia that lead tetrahydride or hydrogen plumbide or plumbane ($\ce{PbH4}$) is supposed to have lead in its -4 state and the hydrogen is in its +1 state because supposedly lead has a ...
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2 votes
1 answer
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Oxidizing properties of sulfuric acid: can it oxidize hydrochloric acid to chlorine?

Can $\ce{H2SO4}$ oxidize $\ce{HCl}$ to $\ce{Cl2}$? I know that $\ce{KMnO4}$ can do it, but my question is considering $\ce{H2SO4}$. In sulfuric acid, sulphur is in +6 oxidation state and in $\ce{KMnO4}...
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9 votes
1 answer
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Can fluorine ever have a positive oxidation state?

I know fluorine is the most electronegative element but can we humans ever synthesize fluorine in a positive oxidation state like +1?
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4 votes
1 answer
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Is Chromium(VI) fluoride able to be synthesized properly?

Chromium(VI) fluoride, also known as chromium hexafluoride is a possible chemical compound with a chromium atom attached to 6 fluorine atoms. It has been unsuccessfully synthesized a number of times ...
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2 votes
0 answers
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Should uranium hexoxide exist?

This compound of uranium called uranium hexoxide or uranium (XII) oxide is a theoretical chemical compound. The uranium should have an oxidation state of +12 ,the highest of any known chemical. The ...
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2 votes
1 answer
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Oxidation number of oxygen atoms in oxygen difluoride

My textbook says: Oxygen is assigned an oxidation number of $+1$ in oxygen difluoride. The number assigned to each Oxygen atom will depend upon the bonding state of oxygen but this number would now ...
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3 votes
3 answers
254 views

Does a change in oxidation number in a redox reaction mean that an actual electron transfer occured?

Oxidation numbers are fictitious charges that pretend the entire molecule is an ion i.e. it artificially localizes electrons onto atoms within a single molecule. In a redox reaction, we find that an ...
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-5 votes
1 answer
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variable oxidation states [closed]

which of the statements is true: looking at the electronic configuration of an element, can the possible oxidation states/oxidation number of an elemnet be predicted. for example, the valence ...
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-1 votes
2 answers
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Is this analogy right? [closed]

Is my logic correct in this case ? Since the formal charge represents the charge the element possess in a covalent compounds, is it right to say that formal charge is the equivalent term for covalent ...
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1 vote
1 answer
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Forcing a steel pipe to rust completely

I understand rust. Fe + H20 → OH- → Fe(OH)2 or 3 and/or FenOm I understand rust prevention and steels that are resistant to rusting. Trying to google this question gives thousands of answers on ...
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Cinnabar decomposition by heating optional method?

Is it possible to decompose cinnabar into $\ce{Hg}$ and $\ce{S}$ instead of $\ce{Hg + SO2}$ with roasting and heating. What conditions need to be satisfied in the new method?
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5 votes
2 answers
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What is the n factor of H2O2 undergoing disproportionation reaction liberating oxygen [closed]

There is a lot of confusion about the n-factor of hydrogen peroxide in its disproportionation into water and oxygen. $$\ce{2H2O2 -> 2H2O + O2}$$ Some sources(1,2) say n-factor of $\ce{H2O2}$ is 2 ...
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2 votes
1 answer
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Determination of metal state from protein X-ray structure

Many proteins or enzymes contain metal ions within their active sites. These metals are often directly involved in the reaction catalysed bu the enzyme. In certain cases the function is well known and ...
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