All Questions
Tagged with inorganic-chemistry oxidation-state
136
questions
1
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107
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Why does balancing the oxidation of dichromate(VI) to chromium(III) require six iron atoms?
The problem:
Balance the following chemical equation using oxidation numbers:
$$ \ce{Fe^2+ + Cr_2O_7^2- -> Fe^3+ + Cr^3+} $$
What I have tried:
$$\ce{\overset{+II}{Fe}^{2+}(aq) + \overset{+VI}{Cr}...
- 133
0
votes
1
answer
475
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Why does balancing the reduction of dichromate(VI) to chromium(III) require four water molecules among the products?
Problem
Balance the following chemical equation using oxidation numbers:
$$\ce{Cr2O7^2–(aq) + HNO2(aq) –> Cr^3+(aq) + NO3–(aq)}$$
Solution (in Swedish)
$$\ce{\overset{+VI}{Cr}_2O7^2–(aq) + H\...
- 133
1
vote
2
answers
247
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Stability of H3MnO4, H2MnO4, HMnO4
I cannot seek out the reason why while $\ce{H3PO4}$ (phosphorus oxidation +5) is relatively stable and obtainable but $\ce{H3MnO4}$ (the same oxidation state +5) is rarely mentioned and perhaps ...
- 620
1
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2
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424
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When HI reacts with H2SO4, why is the sulphate ion reduced to hydrogen sulphide instead of sulfur dioxide?
When $\ce{HI}$ reacts with $\ce{H2SO4}$, it can be represented by the following chemical equation:
$$\ce{8HI + H2SO4 -> 4I2 + H2S + 4H2O}$$
However, when $\ce{HBr}$ reacts with $\ce{H2SO4}$, the ...
- 177
-2
votes
4
answers
108
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Specifying which compound is oxidized/reduced in a redox reaction [closed]
I wrote the oxidation numbers in a redox reaction:
$\rm{2 \overset{+7}{Mn} \overset{-2}{O_4^{-}}~+~5\overset{+4}{S} \overset{-2}{O_2}~+~6\overset{+1}{H}_2 \overset{-2}{O}~~\rightarrow~~ 5\overset{+6}{...
- 171
-1
votes
3
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277
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Do polyatomic ions have oxidation numbers?
In a polyatomic ion, the sum of the oxidation numbers of all atoms is equal to the overall charge on the ion. However, does this polyatomic ion have an overall oxidation number?
We also know that the ...
2
votes
1
answer
269
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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 ...
3
votes
3
answers
535
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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 ...
- 53
1
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3
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661
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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 ...
- 201
4
votes
0
answers
49
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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 $\ce{CCl3CHO}$, ...
- 476
-5
votes
1
answer
88
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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 ...
- 7
1
vote
1
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331
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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 ...
- 583
2
votes
0
answers
51
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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}...
- 293
2
votes
0
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189
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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} \...
user121185
2
votes
3
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266
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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 ...
- 171