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 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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Oxidation state-Ph diagram of Tellurium [closed]

How did we calculate the oxidation state of each of these entities to create this classification ?
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373 views

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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1answer
58 views

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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1answer
78 views

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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1answer
34 views

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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359 views

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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Is Chromium (VI) fluoride 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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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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151 views

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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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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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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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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1answer
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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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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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33 views

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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1answer
959 views

Oxidation State of Nitrogen in N2O

If we try to calculate the oxidation state of nitrogen in $\ce{N2O}$ using the familiar algebraic method, we get oxidation state $+1$ for both nitrogen atoms and that's what I found when I looked it ...
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Ascorbic acid and aldehydes: Reaction and Influencing Metals

I've researched online and I've read that ascorbic acid can both promote oxidation and reduction depending on the conditions (I've read about trace metals but I've never found which metals affect its ...
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1answer
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Why is +3 the oxidation state of Indium? [duplicate]

The three more energy electron layers for Indium(49) are, sorted from lower to higher energy: [Kr] $5\text{s}^24\text{d}^{10}5\text{p}^1$ From this configuration, it could be said that is easy to ...
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What is the composition, function, and classification of “6-Thio-2-Deoxyguanosine” and “13-mer thio-phosphoramidate”? How do I learn more about them?

I am assigned the task of explaining a biomedical research paper, it is about telomere and telomerase , and it talks a lot about the molecule Thio-2-Deoxyguanosine , 13-mer thio-phosphoramidate and &...
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33 views

Oxidation number approximately

I argued with my lecturer when he is saying that during the calculation of oxidation number, and your answer give you like 3.46 you can approximate it to whole number, I know tell him NO that if the ...
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Chemical reaction of bronze tarnishing

Can anyone explain to me the chemical process of bronze tarnishing? According to Wikipedia: Bronzes are typically ductile alloys, considerably less brittle than cast iron. Typically bronze oxidizes ...
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How do I go about solving this question? [closed]

So I've studied Redox concepts but in the exam we are asked questions like these. How am I supposed to know what the reaction is going to be? How do I go ahead and assume what oxidation state it's ...
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135 views

Why can't iodide be oxidised to iodate in acidic medium?

Even if we use a strong oxidising agent like 'permanganate ion in acidic medium' it doesn't help oxidise iodide to iodate, but a relatively weaker oxidising agent 'permanganate ion in alkaline medium' ...
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Write half-cell reaction for a battery

A primary battery has the reaction: $$\ce{2MnO2 + Zn + 2NH4Cl -> Mn2O3 + Zn(NH3)2Cl2 + H2O}$$ Write the half-cell reactions for the given equation. I am having trouble understanding how you know ...
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133 views

Ambiguity in definition of primary valency in Werner's theory

In Concise Inorganic Chemistry (5th Edition) on page 196 , the primary valency of $\ce{[Co(NH3)5Cl]Cl2}$ is given to be 2. In other textbooks and in the question here, we get the idea that: The ...
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1answer
66 views

Counting electrons in Ozonolysis [closed]

I can't understand the electron count made on this page about Ozonolysis. (http://ursula.chem.yale.edu/~chem220/chem220js/STUDYAIDS/ozonolysis/Oz.html) This is the specific part of the article: From ...
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3answers
314 views

What does *oxidizing* have to do with *hydrogen*? [closed]

An oxidizing acid is a Brønsted acid that is a strong oxidizing agent. All Brønsted acids can act as oxidizing agents, because the acidic proton can be reduced to hydrogen gas. (source: Wikipedia) ...
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390 views

Balancing a reaction where dichromate ion reacts with ethanol to give Cr(III) and carbon dioxide

I have only started to learn balancing redox reactions, and a recent question has me confused. The question is : Balance in both acidic medium and basic medium: $$\ce{Cr2O7^2- + C2H5OH -> Cr^3+ + ...
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1answer
158 views

Why does Fe(II) have electrons in the 3d subshell? [duplicate]

The electron configuration for $\ce{Fe^2+}$ in my coursebook is given as: $$ 1\mathrm s^2\, 2\mathrm s^2\, 2\mathrm p^6\, 3\mathrm s^2\, 3\mathrm p^6\,3\mathrm d^6$$ But shouldn't the $4\mathrm s$ ...
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why heavier transition metals can stabilise higher oxidations states [duplicate]

I believe similar questions have been asked but this is different and the answers I have looked at don't answer this question. I have read that oxidation states of heavier transition elements (Ru, Os ...
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1answer
42 views

Reduction by Activated Carbon

Does reduction by carbon itself occur when filtration is performed using activated carbon? Is it part of the central mechanisms involved in activated carbon filtration? One of the specificities of all ...
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29 views

Difference between Oxidation Number and Oxidation State [duplicate]

I know the theoretical definitions and that they do not defer much, infact these terms are used quite interchangeably. However, my chemistry teacher once taught me that Oxidation State of an atom in a ...
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1answer
483 views

Is there a difference between oxidation state and valency?

I just looked up peroxide on Google, and I saw that the oxidation state of oxygen in $\ce{R-O-O-R}$ is $–1$, and not $–2$ (like $\ce{H2O}$), when I could clearly see that each O atom forms two bonds. ...
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Why oxidation number is that important? [duplicate]

Oxidation number looks all but a convenient accounting tool for balancing chem equations. Or does it? Why would a molecule care about its oxidation state? Is a different oxidation state sort of a ...
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Why is copper(II) used a catalyst here instead of as an intermediate?

Photochromic glass, used for sunglasses darkens when exposed to bright light and becomes more transparent again when the light is less bright. The depth of color of the glass is related to the ...
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1answer
110 views

Why isn't chlorine reduced or nitrogen oxidised in the reaction between ammonium perchlorate and aluminium?

A space shuttle’s upward thrust came from the following reaction between aluminium and ammonium perchlorate. $$\ce{10 Al + 6 NH4ClO4 → 4 Al2O3 + 2 AlCl3 + 12 H2O + 3 N2}$$ Which statements about this ...
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219 views

Is it easier to oxidise iron(II) to iron(III) in acidic or alkaline solution? [closed]

Is it easier to oxidise $\ce{Fe^2+}$ to $\ce{Fe^3+}$ in acidic or alkaline solution? $$ \begin{align} \ce{Fe &-> Fe^2+(aq) -> Fe^3+(aq)}\\ \ce{Fe &-> Fe(OH)2 -> Fe(OH)3} \end{align}...
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Is there an error in a Wikipedia article explaining the influence of oxidation states?

Referring to the series of oxoacids of chlorine: $\ce{HClO, HClO2, HClO3},$ and $\ce{HClO4}$, tabulated in the Wikipedia article on electronegativity, the article states, in the section near the end ...
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Determining Oxidation Number [closed]

In NH3, what's the oxidation number of H? Should it be +3 or +1? I'm a little confused what to use.
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Does plant material oxidize from 02 gas (air or solved in water) and/or oxygen in H20? [closed]

https://en.m.wikipedia.org/wiki/Curing_of_tobacco Hi This is my first time growing tobacco for fun, pleasent green at home, to make snuff for personal use and maybe save som money. Ive been reading a ...
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172 views

How to draw the structure and find the oxidation number of Phosphorous in H2P2O7 [closed]

Find the Oxidation number of Phosphorus in $\ce{H2P2O7^2-}$. So I thought of drawing the lewis structure to find the oxidation numbers. Because I wasn't sure if Oxygen was bonded to a Hydrogen or not. ...
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I am having problem with this question including topics of redox reactions and charges [duplicate]

What is the oxidation number of $\ce{Fe}$ in $\ce{K4[Fe(CN)6]}$? This seems to be a pretty easy problem. Just input the oxidation numbers of everything and equate for 'x'. But the problem is that I ...
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789 views

How does overvoltage affect the products of electrolysis?

When you electrolyse an aqueous solution of $\ce{NaCl},$ the product formed at cathode is $\ce{H2}$ gas (preferential discharging), but the product formed at anode is $\ce{Cl2}$ gas. According to ...
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In a battery, what happens to LiCoO2 when the lithium leaves? It becomes CoO2?

What chemical compound exists at the cathode of a lithium-ion battery when the lithium is not there? The cathode is usually described as $\ce{LiCoO2}$, so does it become $\ce{CoO2}$? $\ce{CoO2}$ ...
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Can ZrO2 be made fluoride resistant?

$\ce{ZrO2}$ has great properties, biocompatibility, chemical resistance, decent scratch resistance, great thermal resistance and refraction, but it could be better. It, like glass, will slowly react ...
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400 views

What is the state of aggregation of iodine formed during electrolysis of molten nickel(II) iodide? [closed]

Assume the electrolysis of molten $\ce{NiI2(l)}$ (inert electrodes) in a cell. The cell with a heating element is in the room; the room is at $\pu{25 °C}$ and $\pu{101.3 kPa}.$ The half-reaction for ...
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Is it possible to oxidize beryllium metal around NTP or not?

Perhaps this seems like a really simplistic question to many of you, but I’ve read too many conflicting answers at this point. Simply put, most articles I’ve read have insisted that it isn’t possible ...

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