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.
313
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1answer
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Ambiguity in oxidation state of phosphorus in H3PO3 [duplicate]
Phosphorus(2.19) is less electronegative than hydrogen(2.20), so during calculation of oxidation state of phosphorus the oxidation state of hydrogen should be taken as-1 but in books it's taken as +1 ...
0
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1answer
33 views
How does one calculate oxidation states? [duplicate]
For example, how could I calculate the oxidation state of lead in $\ce{PbS}$? Or for that matter how would I calculate it for sulfur? Or I have two unknowns, for example sulfur in $\ce{PbSO4}$? Do I ...
1
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2answers
48 views
Why does the oxidizing strength of the chlorates decrease with increasing oxidation number?
Here is a table of the standard reduction potentials of the chlorates from wikipedia:
Intuitively, one would expect that the more positive the oxidation state, the more oxidizing that compound would ...
-1
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1answer
52 views
For group 13 elements M³⁺, why is the formation of MCl₄⁻ more favorable than for group 12 elements M²⁺?
I'm not a chemist and I'm trying to understand a chemistry point from a talk I went to recently. Any help would be much appreciated.
The speaker was talking about $+3$ (Group 13) elements in the ...
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1answer
20 views
How electron configuration is related to the oxidation state of an element such as sulphur and can this be extended for elements in other blocks? [closed]
The question arises from trying to get where does the values of $-2$, $0$, $+2$, $+4$ and $+6$ from the electron configuration.
The electron configuration for sulphur $(Z=16)$ is $[Ne]3s^23p^4$.
It ...
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0answers
39 views
CuS+HCl is it a reduction or oxidation reaction
How do we identify whether a reaction is oxidation or reduction and please let me know whether the equation given above is oxidation or reduction.
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0answers
54 views
Oxidation states the elements in nitrosyl chloride
I have read that $\ce{NOCl}$ dissociates to $\ce{NO+}$ and $\ce{Cl-},$ and the various reasons stated as such seem fine.
But what I don't get is this: if we follow the actual rules of assigning ...
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3answers
33 views
Can you create different colors of rust on iron? [closed]
I am looking to see if anyone out there can tell me if there is a way to create different colors of rust on iron. I'm specifically looking to see if I can create blue rust without heating the metal ...
5
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1answer
702 views
How does Potassium Hexfluoronickelate(IV) exist in a stable state?
Nickel generally does not exist in a $+4$ Oxidation state. Wikipedia has the following to say regarding Nickel(IV):
Ni(IV) is present in the mixed oxide $\ce{BaNiO3}$. ....... Ni(IV) remains a rare ...
0
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0answers
91 views
Oxidation number of Oxygen in peroxides: -2 or -1?
My textbook says that the oxidation number of Oxygen in peroxides is -2, but when I searched up the internet, I found it to be -1. It could probably be a misprint in my book, but I am still not sure. ...
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1answer
37 views
why is both types of oxides (Eo2 and Eo) of group 16 acidic? [closed]
the oxidation state of E in Eo2 and Eo3 is +4 and +6 respectively ...then how can both of them be acidic ?
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0answers
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Black substances covering Aluminum Electrode
I have use two aluminum pieces as electrodes to electrolys salt (NaCl) water. After the experiment, I found that wherever electricity flows, the electrode will be covered in some blackish substances. ...
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0answers
180 views
Oxidation number of Si in SiH4
Wikipedia has the following reaction:
$\ce{Mg2Si + 4 HCl → 2 MgCl2 + SiH4}$
This seems to be a double displacement (metathesis) reaction, where $\ce{Si}$ has oxidation state $-4$. However, I ...
3
votes
3answers
191 views
Determining the oxidation state of a bridging platinum complex
I want to ask a question about determining the oxidation state of a Platinum complex.
I was presented today with the following complex and asked to comment on the oxidation state and hence the d-...
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2answers
139 views
Oxidation state of Manganese [closed]
We know that Mn shows variable oxidation states ranging from +2 to +7 but why is +1 oxidation state of Manganese(Mn) not stable?
The +1 oxidation state of Mn would have a configuration of 4s1 3d5.
...
1
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1answer
38 views
Naming a coordination compound
I was asked to determine the coordination compound which has the name:
$$\text{triamminetrinitritocobalt(I)}$$
I thought it must be: $$\ce{[Co(NH3)3(ONO)3]^2-}$$
The $-2$ charge can be deduced by ...
1
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0answers
21 views
Is fluorinated steel corrosion resistant from normal oxidation?
I've recently learned of a compound named Chlorine trifluoride a powerful fluorinating agent. The common way to store it seems to be in regular steel drums where it flash oxidizes the inside of the ...
1
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2answers
733 views
How is Zn not a transition metal? [duplicate]
A transition metal can be defined as an element that possesses an incomplete sub-level in one or more of its oxidization states. In the textbook I'm reading, it claims that zinc is not a transition ...
2
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0answers
284 views
Oxidation state of chlorine in ClO
Today, I had a friendly debate with my friend on what should be the oxidation state of $\ce {Cl}$ in the chlorine monoxide radical. I took the view that it should be $\ce {+2}$ while he took the view ...
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0answers
38 views
Clearing my doubt over Electronegativity and oxidation state
I was doing a question in which we were required to find the oxidation state of $\ce{H3PO3}$. I knew the structure that is:
Now, Phosphorus being less electronegative than oxygen get $+2,+1,+1$ ...
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1answer
72 views
Question About Reversible Reactions and Batteries
So my book says that the batteries we have considered so far( Daniell cells) are low life span, because they reach equilibrium too fast. In the next paragraph, it says they are also made by ...
3
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1answer
210 views
How can batteries reach equilibrium if the reactions are irreversible?
My book says that the batteries we have considered so far (Daniell cells) have a low life span because they reach equilibrium too quickly.
In the next paragraph, it states they are also made by ...
8
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1answer
314 views
The oxidation state of iodine in iodoxybenzoic acid
I am slightly puzzled by this seemingly trivial question. The idea behind assigning oxidation states is simply to treat every single bond made by the atoms as ionic bonds. That is to say, both the ...
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2answers
85 views
Why is this reaction not a redox? [closed]
My question may seem too simple. But I couldn't find why this is not a redox.
$$\ce{Hg2(NO3)2 + 2KBr -> Hg2Br2 + 2KNO3}$$
In $\ce{Hg2(NO3)2}$ compound atoms have following states:
O: -2
N: -3
Hg:...
2
votes
1answer
67 views
Are there chemicals that absorb and release upon heating oxygen more efficiently than potassium oxide? [closed]
$\ce{K2O}$ absorbs oxygen forming $\ce{K2O2},$ which decomposes to $\ce{K2O}$ and $\ce{O2}$ at 500 °C. This means that $\ce{K2O}$ can absorb up to 17% its mass of oxygen. Are there other substances ...
2
votes
1answer
90 views
Do different oxidation states of the same element have the same emission spectrum?
I looked at the flames of copper (I) chloride and of copper (II) chloride through a spectroscope and they looked the same. The flame colour is the same too. But since they have different oxidation ...
0
votes
1answer
55 views
Balancing the chemical equation using Oxidation Number Method [closed]
Permanganate ion reacts with bromide ion in basic medium to give manganese dioxide and bromate ion. Write the balanced ionic equation for the reaction.
Please balance the equation using the oxidation ...
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votes
1answer
62 views
Cup with vinegar/salt/copper solution previously in it ran through dishwasher
Someone enjoys making jewelry, and saw an online tutorial saying that you can mix equal parts of vinegar and salt, and leave copper in it for a while to oxidize it, and turn it green.
After doing ...
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votes
1answer
52 views
Why do we need to use oxidation number in order to balance a complex chemical reaction easily in an acidic or alkaline medium? [closed]
I have been trying to balance this chemical reaction in an "acidic" medium without using oxidation number or ion electron method: [$\ce{Fe^2+ + Cr2O7^2- -> Cr^3+ + Fe^3+}$].
Though I can balance ...
16
votes
1answer
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What is the oxidation state of Mn in HMn(CO)5?
What is the oxidation state of $\ce{Mn}$ in $\ce{HMn(CO)5}$? If $\ce{H}$ has an oxidation state of $+1$, then $\ce{Mn}$ should have oxidation state of $-1$, which I'm not sure is possible.
On the ...
0
votes
1answer
276 views
Which of the following reactions doesn't represent an oxidation-reduction [closed]
Which of the following reactions doesn't represent an oxidation-reduction?
$$
\begin{align*}
\ce{2 P + 5 HClO + 3 H2O &-> 2 H3PO4 + 5 HCl} \\
\ce{Zn + 2 HCl &-> ZnCl2 + H2}...
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0answers
71 views
Is it possible to synthesize permanganate electrochemically?
I have been researching the production of peroxy acids and other strong oxidizers. I was wondering if it's possible to produce permanganic acid if I were to cast an anode containing Manganese Dioxide ...
2
votes
0answers
122 views
Structure and oxidation state of bridging complexes
I am confused about the structure of bridging complexes with the bridging ligands as $\ce{OH-}$ or $\ce{NH2-}.$ Aren't they both monodentate ligands?
And if they form a simple coordinate bond, then ...
6
votes
1answer
76 views
What happens to the carbon in carbon steel when it rusts?
Carbon steel is iron containing some carbon in various forms of iron carbide.
When it rusts (oxidises), the iron becomes part of all kinds of crystalline and amorphous iron oxides and hydroxides, ...
2
votes
0answers
85 views
Amphoterism and the Metal and Non-Metal Oxides/Hydroxides. Why does amphoterism occur in these? [closed]
I am having trouble understanding why Beryllium Oxide and Aluminum Oxide are amphoteric. Also, while they are not oxides, Aluminum and Beryllium Chloride as well.
Most of the things I have been ...
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0answers
66 views
Why is there visible liquid (possibly water) on matches when they're burning?
I was just burning a normal standard match and I observed visible liquid running down the wooden shaft as the fire burns and consumes it, what could explain such phenomenon ? could it be that the wood ...
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2answers
187 views
What is the physical meaning of fractional oxidation numbers of elements in compound
Many times I encounter oxidation numbers like -1 in the peroxide for oxygen, -1/2 in superoxide, and in some other compounds some elements have 8/3 or such like that...what is the physical meaning of ...
2
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0answers
89 views
Oxidising nature of hydrogen peroxide [closed]
It is said that $\ce {H2O2}$ behaves like a reducing agent in an external oxidizing environment but along with $\ce {H2SO4}$ a strong oxidizing agent it oxidizes $\ce {FeSO4}$ to $\ce {Fe2(SO4)3}$ in ...
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votes
1answer
33 views
Are there processes of electric discharge to oxide As(III) into As(V)? [closed]
I want to know if there were any known experiment of electric discharge to oxyde the ion arsenic(III) into the ion arsenic(V).
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0answers
15 views
Nitrate reaction with iron minerals
I am trying to find literature or an answer to what happens to nitrate as it comes in contact with iron oxides. Does the nitrate get reduced to ammonium in all cases of iron(II/III) oxides? What is ...
7
votes
1answer
102 views
Reference for electronegativities of different metal oxidation states
A long time ago I was researching the effect of the self regulatory response in Fe and Co. I found that my results made sense based on the idea of the electronegativity of the ions considered. I found ...
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2answers
155 views
Unusual oxidation numbers for alkaline earth metals?
Are there compound of alkaline earth elements showing unusual oxidation numbers? For the sake of the question, every oxidation number different from +2 counts as unusual, most exciting would be ...
3
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1answer
114 views
Are there known compounds of caesium with oxidation number >1?
Given that the left neighbor of caesium, xenon, does have fluorides and oxides, it is not inconceivable that caesium can have oxides or fluorides with an oxidation number higher than 1. Are such ...
2
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1answer
100 views
How to find oxidation state of Co and Cr in [Co(NH₃)₄(NO₂)₂][Cr(NH₃)₃(NO₂)₃]?
Which of the following options represents the oxidation state of $\ce{Co}$ and $\ce{Cr}$ in the given complex?
$$\ce{[Co(NH3)4(NO2)2][Cr(NH3)3(NO2)3]}$$
(A) $2, 3$
(B) $3, 2$
(C) $3, 3$
...
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0answers
588 views
Finding the n-factor of C₂O₄²⁻
In the reaction $\ce{C2O4^2- → CO2}$ the $n$-factor of $\ce{C2O4^2-}$ is:
So I think the answer to this question is $2$ because in $\ce{C2O4^2-}$ the oxidation number of carbon is $+3$ and in $\ce{...
1
vote
1answer
172 views
Negative oxidation state
Why doesn’t aluminum have negative oxidation states? In almost all compounds of aluminum which I know of has positive oxidation state.
It has valence EC [Ne] 3s2 3p1 , my teacher told it usually ...
-1
votes
1answer
93 views
Why oxidation state decreases
oxides of group 1 elements are Li2O , Na2O2 , KO2 , RbO2
Oxygen’s oxidation state in each compound is -2 , -1 , -1/2 ,-1/2 respectively I.e oxide-> peroxide-> superoxide
my question
The oxidation ...
2
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0answers
45 views
Reactivity of Ni Vs. Pd - available oxidation states
I'm hoping someone can help me tighten up my understanding of the origins of the differences between Ni and Pd catalysis.
I understand that Ni has higher charge density and this is the reason for it'...
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0answers
30 views
Can an element have variable oxidation states in a compound?
Take propanoic acid for example. If I assign oxidation states to the 3 carbons in it using the idea that the more electronegative element gets all the electrons in the bonds it makes, the 3 carbons ...
2
votes
1answer
1k views
How to determine the greatest d orbital splitting?
This question comes specifically from an IB Chemistry HL Paper 1 in May 2018 TZ1, namely question 8.
Which complex has the greatest d orbital splitting?
It gives 4 Complexes $\ce{[Fe(H_2O)_6]^{2+}}$,...
