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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2answers
190 views

Meaning of charges in a group?

In my class, my professor said that since hydrogen is in group one, it has a charge of 1+. Does this refer to its ionic charge or to its oxidation state?
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What are oxidation states used for?

When I took high school chemistry many years ago, considerable effort was spent on teaching us to compute oxidation states of atoms in various compounds, following a set of rules that looked somewhat ...
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1answer
413 views

Clarification on Oxidation Number and Ionic Charge

I am confused on the differentiation between ionic charge and oxidation number (state). For example and simplicity, $\ce{NaCl}$ is an ionic compound so it forms $\ce{Na+}$ and $\ce{Cl-}$. Are these (...
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3answers
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Oxidation states of oxygen

I'm given a question: Oxidation number of $\ce{O}$ in $\ce{BaO2}$ is $x$ and in $\ce{OF2}$ is $y$; then the value of $x+y$ is what? Now my main question is that if $\ce{F}$ has $-1$ valency in $...
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0answers
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Why is potassium permanganate coloured? [duplicate]

$\ce{Mn}$ in $\ce{KMnO4}$ is in $+7$ oxidation state, has no d electrons so d-d transition is not possible. Then, how is $\ce{KMnO4}$ coloured?
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Identifying an unknown white oxidizing powder

I am working with a unknown white oxidizing powder that melts at around 500 degrees Fahrenheit. It turns my finger green when it comes into contact with my finger for a short while. It leaves a very ...
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3answers
7k views

Elements with multiple oxidation states

I downloaded a periodic table app which gives detailed information for each element. The app shows some elements, however, have two different oxidation states. Hydrogen, for instance, can have either ...
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1answer
70 views

How will metallic lithium react with atomic oxygen?

Very high in Earth's atmosphere, there's a lot more atomic oxygen than anything else. Although I'm sure the energies involved in keeping oxygen in this state are an important variable, I'm interested (...
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1answer
312 views

Which it is the oxidation state of indium and phosphorus? [closed]

I would like to know what the oxidation state of indium and phosphorus in a structure type rock salt. It could be +1 and -1? Yes or not? and why? Thanks
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1answer
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Group of Potassium and It's Oxidation Number

One of the questions I got wrong on a chemistry Kahoot question was (1) Potassium is in group $1$, what is its oxidation number? (a) -1 (b) +1 (c) +2 (d) -2 I don't remember what an "oxidation ...
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1answer
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Anomalous oxidation states of Transition Metals

I have noted down the available positive oxidation states of the first row of transition elements (on the Periodic Table) from the respective Wikipedia articles of the elements. $\ce{Sc} - 3, ...
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1answer
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Is it possible for halogens to show oxidation states less than -1?

Halogens like $\ce{Cl,Br,I}$ generally show oxidation states between $-1$ and $+7$. However, is it possible that they can show an oxidation state beyond $-1$ (e.g. $-3$)? I was thinking of some ...
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Oxidation number in Coordination Compounds

How to determine the oxidation number of the central metal atom in case both cation and anion is a complex? For example: [$\ce{Pt(NH3)4}$][$\ce{PtCl6}$]
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1answer
435 views

Determine oxidation in organic chemistry through oxidation numbers?

I want to determine the carbons that are oxidatized in an organic reaction. Is it an acceptable way to first figure out the oxidation number of every carbon in reactants and products and then compare ...
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1answer
767 views

How to write half equations based on oxidizing/reducing agents pairs?

In most videos, people use oxidation numbers to find the oxidizing agent and the reducing agent, It's a great way to use, but our teacher never used it before he would give us a reaction and ask us ...
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Oxidation state of fluorine in HOF

What should be the oxidation state of $\ce{F}$ in $\ce{HOF}$. As fluorine is the most electronegative element in the periodic table, it should be $-1$. But when I googled it, I found that many ...
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1answer
67 views

How to know the ionization power of an unknown metal? - difficult

Imagine having the 4 following beakers: where P, Q, R and S are metallic plates. In beaker 1 and beaker 2 nothing happens. However in beaker 3 and 4 the metalic pieces become thinner. How would you ...
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1answer
60 views

How to calculate whether a redox reaction is spontanuous?

I have some difficulties to apply the basic concepts of calculating whether a reaction is spontanuous or not. given: $$\ce{H_2SO_3(aq) + 2Mn(s) +4H^+(aq) -> S(s) + 2Mn^{2+}(aq) +3H_2 O(l)}$$ and ...
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understanding redox reaction

I am a total noob in chemistry, so sorry in advance if this is a very stupid question... I am trying to solve this redox reaction: $$\ce{KClO3 + FeSO4 + H2SO4 -> Fe2(SO4)3 + KCl}$$ $$\ce{K^{+1}Cl^{...
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1answer
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Why are fluorides of transition metals unstable in low oxidation states? [duplicate]

Why are fluorides of transition metals unstable in low oxidation states? I would think that since fluorine and oxygen are highly electronegative, it's obvious that they be stable at high oxidation ...
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3answers
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Oxidation number of phosphorus in phosphine

Electronegativity of $\ce{H}$ is greater than $\ce{P}$, but according to my book in $\ce{PH3}$, $\ce{P}$ has oxidation number of -3. How is it possible? Is any of the data wrong?
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1answer
658 views

In what compounds does oxygen exhibit +½ oxidation state?

Theoretically it is said that the compound can show oxidation states in the interval $[n,n-8]$ where $n$ is the number of valence electrons. Is there any compound in which oxygen shows +1/2 oxidation ...
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1answer
681 views

Oxidizing and reducing agent

What i know about the above question is that a compound acts as an oxidising as well as reducing agent when the oxidation of central metal is somewhere between it's maximum and minimum oxidation state ...
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1answer
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Why is SnCl2 produced when tin reacts with hydrochloric acid?

$$\ce{Sn + 2HCl -> SnCl2 + H2}$$ Our teacher told us that it's because $\ce{Sn^2+}$ is more stable, but I can't find that in any textbook. Why is $\ce{Sn^2+}$ in the chloride product over any ...
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4answers
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Why is MnO2 not a peroxide?

As I know, $\ce{MnO2}$ is called manganese(IV) oxide. Why can't we name it manganese peroxide since manganese(II) exists too? In other words, how do we know that the oxidation number of manganese in ...
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1answer
335 views

Why don't we see these lanthanide species?

For most lanthanide metals$^{[1]}$, the stable oxidation state is III. The general electronic structure$^{[2]}$ is $$\ce{[Xe] 4f^{0}^{-14} 5s^2 5p^6 5d^{0}^{-1} 6s^2}.$$ Elements that have the d-...
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Predominance of III oxidation state for lanthanides [closed]

For most lanthanide metals, the stable oxidation state is III [*]. The general electronic structure is $$\ce{[Xe] 4f^{0}^{-14} 5s^2 5p^6 5d^{0}^{-1} 6s^2}\ \ [**].$$ Elements that have the d-electron ...
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1answer
492 views

Oxidation states of iron in Roussin's salts

For preservation of meat, sodium nitrite is usually added and as a result $\ce{NO}$ is then formed. Consequently, $\ce{NO}$ reacts with the sulfur and iron atoms from decomposition of proteins, ...
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Is it possible for one specific atom in a molecule to have a non-integer oxidation state?

I am wondering if fractional oxidation states of an atom are possible. I'm not referring to cases such as $\ce{Fe3O4}$ or $\ce{Mn3O4}$ where the average oxidation state is fractional, since these ...
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2answers
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Why doesn't iron(III) iodide exist?

$$\ce{Fe2O3 + 6HI -> 2FeI2 + I2 + 3H2O}$$ Why don't we get $\ce{FeI3}$? After all, iron's oxidation state is $+3$ in the reagent. Should one just memorize that up to bromine, it's $\ce{FeX3}$, ...
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What is the oxidation state of copper and iron in chalcopyrite?

What is the oxidation state of Cu and Fe in chalcopyrite ($\ce{CuFeS2}$)? Some websites tell that it is $\ce{Cu(I)Fe(III)S2}$, and others tell that it is $\ce{Cu(II)Fe(II)S2}$. Which is right?
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2answers
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What is the most common oxidation state of gold?

I had a test this morning which had the following question: What is the most common oxidation state for gold? (a) +1 (b) -1 (c) +2 (d) +3 Since the electronic configuration of $\ce{Au}$ is $\...
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1answer
656 views

Different between molecular and ionic equations

I want to know if ALL equations have to be balanced? Say for example if Hydrogen gas (H2) burns in air (O2) to form water (H2O) I get the following: H2 + O2 --> H2O. Means that balanced would be ...
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How to calculate n factor for salts in this reaction?

My source says : For salts which react such that no atom undergoes change in oxidation state , n-factor for such salt is the total moles of cationic /anionic species replaced in 1 mole of the salt . ...
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1answer
183 views

Setting up half-reactions

I am completing a worksheet on Balancing Oxidation-Reduction reactions but am stumped on how to set up the half reactions when the oxidation and reduction agents are molecules on both the reactant and ...
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3answers
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How can chlorine have an oxidation number of 3 in chlorite?

I am studying redox reactions right now and I'm a bit confused about something: $\ce{ClO2^-}$ is a compound ion and in a compound ion the sum of oxidation state of participating ions has to be equal ...
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1answer
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Why isn't thallium triiodide stable?

We know that stability of higher oxidation state (+3) decreases and stability of lower oxidation state (+1) increases, so thallium is most stable in its +1 oxidation state due to the inert pair effect ...
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1answer
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How do I determine the average carbon oxidation numbers in ethanol and ethanal?

I have an assignment (I quote it word by word): Determine the oxidation number of carbon in (A) ethanol and (B) ethanal. Answers are (A) -2 and (B) -1. I reviewed similar question at SE: ...
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2answers
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Best oxidizing and reducing agents: Na, Zn^2+, Ba, Ba^2+, and Ag?

Which is the best oxidizing agent and the best reducing agent from the species listed below? $\ce{Na,~Zn^2+,~Ba,~Ba^2+,~Ag}$ I determined that oxidizing agent as $\ce{Zn^2+}$ because it appears on ...
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0answers
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Why can Bi not achieve its 4+ oxidation state?

Bi can reach its 3+ and 5+ oxidation state. Why not 4+? Can you use the inert pair effect here to explain this?
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1answer
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Why does bromine react with iron(II) but not iodine?

My question comes from the answer (C) to this question: Firstly, (correct me if I'm wrong please) I thought that the answer could either be C or D since the other answers are negative ions which can'...
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1answer
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Difference between oxidation and formal charge

What is the difference between oxidation number and formal charge? I am confused about the two.
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1answer
3k views

How to assign oxidation number of sulfur in thiocyanate anion?

Recently I was trying to balance a redox chemical equation: $$\ce{CuSCN + KIO3 + HCl <=> CuSO4 + KCl + HCN + ICl + H2O}$$ The equation is in principle simple to solve; one element ($\ce{I}$) ...
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Why is the oxidation state of carbon in carbon monoxide +2? Why does its dipole moment point from oxygen to carbon? [duplicate]

Shouldn't it be +3 since 3 of its electrons are being pulled away by the electronegative oxygen? Also, shouldn't the dipole moment point from the carbon to the oxygen since most of the electron ...
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Galvanic cell of copper and zinc

When we dip zinc metal in zinc sulfate solution, does zinc sulfate ionize into Zn and sulfate ions? Zinc ions come into the solution as Zn$^{+2}$ so why is the metal not completely dissociated? Why ...
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1answer
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Oxidation state of nitrogen in triazirine (HN3)

The book asks me to find the oxidation state of nitrogen in the below compound: To find the oxidation state using Lewis structure, I have to compare the electronegativity of the bonded atoms and ...
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3answers
18k views

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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0answers
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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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0answers
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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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2answers
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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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