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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Oxidation state of nitrogen in HN3

The book asks me to find the oxidation state of nitrogen in the compound below (the structure is not the one given in Wikipedia for HN3): To find the oxidation state using Lewis structure, I have ...
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What is the oxidation state of nitrogen in N2O5?

According to the formula it should be +5 but according to its structure shouldn't it be +4? How is it +5 then?
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Why and how do we get NH4NO3 when reacting very dilute HNO3 with Zn?

From Russian Wikipedia's article on nitric acid: It's clear that as we decrease the concentration of nitric acid, we get more and more reduced nitrogen: in $\ce{NO2}$, the oxidation state of N is ($\...
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How do partially protonated sulfate ligands affect a metal's charge?

I'm currently reviewing the Periana-Catalytica system and I have a question about one of the intermediates, namely $\ce{[(bpym)Pt(OSO3H)2]^+}$, which is found in the following tutorial review. How do ...
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Determine the oxidation number of sulfur in SF6

I've just started learning about redox chemistry and oxidation numbers. I can work out most of the oxidation number questions, but I don't know how to determine the oxidation number of sulfur in $\ce{...
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What factors influence the resultant oxidation state of Fe in 3Ca(OH)2+2FeCL3?

$\ce{3Ca(OH)2 + 2FeCl3 -> 2Fe(OH)3 + 3CaCl2}$ What factors influence the resulting oxidation state in the iron hydroxide molecule in this reaction? Since iron's oxidation state ranges from +2 to +...
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2answers
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What is the oxidation state of carbon atoms in Ethanoic acid?

The oxidation states of $sp^2$ and $sp^3$ carbon in ethanoic acid are $-3$ if we do not consider the electronegativity difference of these two carbons due to their different hybridisation but this ...
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988 views

Difference in the change in oxidation states of transition elements and p-block elements

In transition elements the oxidation states differ by one (+2 to +7 in Mn). However, in the p-block elements, the oxidation states differ by two (-1,+1,+3,+5 in the halogen group). Why is this so?
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Oxidation state of sulfur in H2S2O5

How can I find the oxidation state of sulfur in $\ce{H2S2O5}$ using its structure? This is the structure of $\ce{H2S2O5}$:
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2answers
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What is the oxidation state of C in this lewis structure?

What is the oxidation state of $\ce{C}$ in this lewis structure? I know how to find it: based on the number of electrons leaving/coming to the most/least electronegative element. But it s the $\ce{OH}...
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Why is Mo(VI) more stable than Cr (VI)?

Acids of $\ce{Mo}^\mathrm{VI}$ are more stable than those of $\ce{Cr}^\mathrm{VI}$ in terms of redox reactivity. In p-block elements, as we go down the groups, the stability of lower oxidation state ...
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How to differentiate the notation of a compounds charge and an anions oxidations state?

I have had the case a few times. Being given something of this form: $$\ce{Cr2O7^2-}$$ How do I know whether the $2-$ is referring to the oxidation of the oxygen anion or the charge of the whole ...
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What is the meaning of the “-osic” suffix on a metal (e.g., cobaltosic oxide)?

I just came across the term cobaltosic for the first time in the abstract of Ind Eng Chem Res 52(18): 6076, 2013 (emphasis added): A nanocomposite of cobaltosic oxide and nitrogen-doped graphene ($\...
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448 views

Why is it lead(II) chromate and not lead(II) chromate(VI) tetraoxide?

I am just beginning in chemistry and learning how to name the different molecules. I have this molecule: $\ce{PbCrO4}$. I would give it the following name: lead(II) chromate(VI) tetraoxide. Lead and ...
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Why does tin form tin (II) compounds?

The stability of the +II oxidation state in lead has been widely attributed to the so-called “inert pair effect”: the 6s subshell is stabilized through relativistic contraction due to the near-c speed ...
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How to calculate the oxidation number of sulfur in H2SO5?

I am in class 11th and I am having trouble solving the question. Calculate the oxidation number of sulphur in $\ce{H2SO5}$? (The answer is given as as $+6$.) $\ce{H2SO5}$ exists it is named as "...
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Typesetting oxidation state and charge simultaneously

I'm currently trying to typeset the ion $\ce{Cr2O7^{2-}}$ with oxidation numbers on. My first thought was to put the oxidation state above the atom, but according to IUPAC, the oxidation state should ...
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Why does ozone reduce to oxygen?

The O's in ozone and in dioxygen all have oxidation states of 0. If this is the case, why is ozone considered to be reduced to form dioxygen (since there's no change in oxidation state)? Would the ...
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Propanoic acid reaction with potassium permanganate

I was conducting a lab where we have to identify/justify how functional groups affect the oxidation of a molecule. I used propene, propanone, and propanoic acid for this reaction. From what I have ...
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How do we know if a compound can be oxidized?

I'm studying organic chemistry, and I have to identify compounds that can be oxidized in some exercises I am doing. For instance, an $\ce{R-CHO}$ can be oxidized further, but an $\ce{R_{3}-COH}$ ...
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1answer
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Oxidation state of ions in a unit cell

Given that $\ce{Al2O3}$ is face-centered cubic (cubic-closest packed) with respect to oxide anions, I am instructed to find the oxidation state of each aluminum ion "fragment" in the unit cell. Let'...
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Oxidation state of metals in complexes with bridging ligands [closed]

How do I find the oxidation number of $\ce{Co}$ in a coordination complex like the tetraaminecobalt(2) $\mu$-amido $\mu$-oxo tetraamine cobalt(2) ion? I searched all over the net but can't find it ...
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What is the term for a compound where one element exists in two oxidation states in the same molecule?

Example nitrogen in $\ce{N2O}$ (−3 and +5). I'm pretty sure there's a term but I've forgotten what it is I thought it was disproportionation but this seems to only refer to a reaction
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Does a Na2SO3 solution oxidize to Na2SO4 in an oxygen rich atmosphere?

Let's assume I have a pure solution of water and $\ce{NaOH}$. When this solution comes in contact with an atmoshpere containing inert gases and $\ce{SO2}$, then $\ce{NaHSO3}$ and $\ce{Na2SO3}$ will be ...
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220 views

Is xenon electropositive in compounds of xenon?

Do you agree with the below passage in my text? Electronegativity is defined as the ability for something in a covalent framework to attract electrons also in covalent bonds. Electropositivity is ...
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504 views

Why does chlorine oxidise iron to iron(III), not iron(II)?

I was asked to predict the product of the reaction between iron metal and chlorine gas: $$\ce{Fe +Cl2->} ?$$ The product here is supposed to be $\ce{FeCl3}$. But how would we know if the product ...
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Why does oxidized copper become green?

Why does oxidized copper turn green? I am sorry if this question is too basic, but am really stumped here. It would be helpful if one could provide a research paper or website with your answer.
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Forming magnetite on cast iron pan

I am in the process of seasoning a cast iron pan. (Creating the black non-stick coating typical of such pans.) This is done by causing thin layers of flaxseed oil to polymerize and bond to the iron. ...
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841 views

Negative oxidation states of Si

According to List of oxidation states of the elements, silicon has a possible oxidation state of $-4$. Now, I've been looking everywhere for a compound that contains Si(-IV), but I cannot find any ...
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2answers
95k views

What is the balanced equation for the reaction of potassium permanganate, iron sulfate, and sulfuric acid? [duplicate]

I'm trying to balance the following redox equation. I think this is happening in acidic solution, the textbook doesn't specify anything more. Can you please help me understand if I got the half ...
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1answer
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Why is sodium chloride edible whereas both sodium and chlorine are highly reactive?

Sodium chloride is edible. But elemental sodium and chlorine are highly reactive and poisonous. What is the difference? Also, is there any difference in eating sodium chloride in powder form and ...
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How to balance more complex redox reactions?

I'm in an advanced level chemistry course, and so far we've been introduced to balancing redox reactions. The basic ones like $$\ce{MnO4- + Cl- -> Mn^2+ + Cl2}\tag1$$ are pretty easy for me, but ...
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1answer
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Name the following coordination complex

What are the IUPAC rules when naming a coordination complex like: $$\ce{[Pt(NH3)4][Pt(NH3)Cl3]}$$ Now according to my textbook, it is named as tetraammineplatinum(II) amminetrichloridoplatinate(II)...
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Oxidation of Carbons

In which of the reactions below is the first compound in the equation NOT oxidized? The correct choice is (D), which can be seen through process of elimination, but I was wondering how to do this ...
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Checking if it is a redox reaction

Ethanoic acid dissociates according to the following equation: $$\ce{CH3COOH + H2 O -> CH3COO- + H3O+}$$ I want to know if it is a redox reaction or not. In the ethanoic acid I obtained that the ...
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How is the triferric tetroxide of iron possible?

If oxygen has a valency of $-2$, $4$ of it would result in $-8$. But iron doesn't have a (variable) valency of anything that goes to $-8$. Then how is $\ce{Fe3O4}$ possible?
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Do atoms form either a positive or a negative charge, but not both?

I do not mean at the same time, of course, but I mean it appears from an overview of the common charges formed from ionizing various elements that each element forms one or more of either positive or ...
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How can nitrogen achieve +5 oxidation state?

Nitrogen has no available d-orbitals. Yet, it forms compounds where its oxidation state is +5, like in nitric acid. How?
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Oxidation numbers [duplicate]

An element have many oxidation numbers, then which one should we consider in the given question? e.g. In the compound $\ce{HCN}$ as $\ce{C}$ {carbon} has +4,+2,-4 oxidation numbers and $\ce{N}$ {...
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Why does carbon monoxide have a greater affinity for hemoglobin than oxygen?

Hemoglobin is an iron-containing oxygen transport metalloprotein in the red blood cells of most mammals. Simply put, it's a carrier protein. Interestingly it doesn't carry carbon dioxide in the same ...
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1answer
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Oxidation of Carbon atom in Alkene, Alkyne and Alkanes of functional groups?

Nomenclature priorities are in order of the degree of oxidation of the carbon atom. I am not sure if it's advisable to just take it as it is and use it or try to understand the basis of the ...
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895 views

Formation of magnesium bismuthide

Magnesium shows an oxidation state of $+2$ and bismuth shows an oxidation state of $+3$. Both do not show a negative oxidation state. Then how is magnesium bismuthide ($\ce{Mg_{3}Bi_{2}}$) formed?
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Why is Sulfur trioxide a neutral electrophile?

My chemistry book says, an electrophile is a reagent which is atrracted to electrons, therefore positive ions and reagents with incomplete octets act as electrophiles, Sulfur trioxide belongs to ...
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2answers
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Is ClH7 possible? [duplicate]

Chlorine can be $sp^3d^3$ hybridized. If so, it can form $\ce{ClH_7}$ and then chlorine, being more electronegative, will have (-7) as its oxidation number. But we know that the oxidation number of $\...
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Why any other element except fluorine wouldn't take electrons from oxygen?

My teacher said that fluorine is more electronegative than oxygen thus it will take electrons of oxygen. But now, why won't other Group 17 elements, like chlorine, bromine, iodine, would take ...
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Possible ionization and fragmentation of chemicals

Is there any generic method where I can know/calculate/generate the possible ionization and fragmentation of a specific chemical, for example, hydrogen chloride and water? This question is actually ...
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2answers
5k views

Oxidation number of hydrogen in compounds

In a given compound that contains three elements (e.g. a metal, a non-metal, and hydrogen), how can it be determined whether hydrogen is connected to the metal or the non-metal so that its oxidation ...
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Why are multiple oxidation states useful for a catalyst?

Transition elements are good catalysts because they have multiple oxidation states?Why multiple oxidation states matter?
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How does radiation facilitate the formation of tetravalent iron?

In reading the article abstract What Oxidation State of Iron Determines the Amethyst Colour?, the author states that in regards to the gemstone amethyst, from clear quartz: The crystal was ...
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Why are inert gas (especially Xenon) compounds powerful oxidizing agents?

I am curious as to why compounds with inert gases, such as $\ce{XeF4}$, $\ce{XeF2}$, and $\ce{XeO3}$ are considered powerful oxidizing agents. I would attribute the phenomenon to the highly oxidized ...

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