Questions tagged [redox]

Redox is the portmanteau of reduction and oxidation. This tag should be used in questions where both the reduction and the oxidation process are under focus. This tag is not limited to inorganic chemistry. If the question is specifically about either reduction or oxidation (not both) of an organic compound, use [organic-reduction] or [organic-oxidation] instead.

Filter by
Sorted by
Tagged with
-1
votes
1answer
54 views

How do I balance redox equations with three reactants?

Could anybody please explain me the concept of balancing redox reactions with three reactants? Either some solving steps or even the solution would be very appreciated. For example, I don't know how ...
-1
votes
0answers
21 views

Which of the following reactions is a redox reaction? [closed]

Which of the following reactions is a redox reaction? a- Scandium with water b- Ag with HCL c- Cu with HCL d- all the above Guys, I dunno how to solve this question, How do I know if this is a redox ...
-1
votes
0answers
41 views

The electrolysis of aqueous sodium chloride: The products at cathode and anode

What will be produced at cathode and anode during the electrolysis of aqueous $\ce{NaCl}$? Suppose we carry out electrolysis of dilute $\ce{NaCl}$ and we need to find the products at cathode and ...
1
vote
1answer
36 views

Does nascent Oxygen/Hydrogen really exist or just or is it just electron from ionic equation? [duplicate]

Recently I was taught by my teacher that there is no such thing as nascent oxygen neither hydrogen. It just represents Electrons from ionic equations. Then he proceeds to give example of following ...
2
votes
1answer
92 views

How to derive formulas for n factor of different types of reactions?

While studying Redox reaction, I came across this term called n-factor which seems to me as a short-cut trick to do the questions quickly. Since I am preparing for a competitive exam so our chemistry ...
0
votes
0answers
40 views

Promoting calcium carbonate decomposition [closed]

It is well-known that calcium carbonate undergoes thermal decomposition forming calcium oxide and $\ce{CO2}$. However, the reaction requires a lot of heat (approximately 840 °C). Is it possible to ...
1
vote
1answer
23 views

Reducing sugars and redox potential

I am wondering if reducing sugars are those that can act as reducing agents, and they act as such with Tollens and Fehling reaction, then what's the redox potential here? And is it a reversible ...
1
vote
0answers
30 views

Electrode potential of Br2/HBr half cell

I am wondering if it is possible to find the electrode potential of such a half cell: $$\ce{Br2 (l) + 2 e- <=> 2Br-(g)}$$ The standard electrode potential is for $\ce{Br-(aq)}.$ However, is it ...
-2
votes
0answers
40 views

What is the theoretical energy density of octaoxygen?

Due to the higher density and stressed bonds, I imagine the energy per gram in octaoxygen is much higher than in conventional oxygen, however the calculations needed to achieve this value is beyond my ...
1
vote
1answer
65 views

Oxygen-releasing material at ≤ 200 °C [closed]

I have to anneal a ceramic in high oxygen pressure, in an autoclave. For this purpose I need a chemical which can release oxygen at temperature less than or at 200 °C. Would appreciate any suggestion. ...
1
vote
0answers
30 views

Lithium Air vs Li Fluoride battery capacity [closed]

Lithium air aka lithium oxygen batteries are described as highest theoretical capacity battery possible. In wikipedia, it says lithium air has energy density 5210 Watt hour per kg, including weight of ...
1
vote
2answers
65 views

Extraction of copper from chalcopyrite

During the extraction of copper from chalcopyrite ore, the ore ($\ce{Cu2S.Fe2S3}$) is heated to form $\ce{Cu2S}$ and $\ce{FeS}$. Then during smelting it reacts with $\ce{O2}$ to form $\ce{Cu2O}$. Then ...
2
votes
0answers
32 views

Do decomposition potentials change during electrolysis?

I was just wondering if decomposition potentials actually change during electrolysis. For example, if we reversed the Daniell cell reaction so that copper is oxidized, the half cell reactions would be:...
0
votes
1answer
79 views

Calculating Gibbs free energy change when the state of ions is unknown

Problem Calculate $\Delta G^\circ$ for the following reaction: $$\ce{Zn(s) + Ag2O(s) + H2O(l) -> Zn^{+2}(aq) + 2Ag(s) + 2OH-(aq)}$$ Given $E^\circ_{\ce{Ag+/Ag}} = \pu{0.80 V}$, $E^\circ_{\ce{Zn^{+...
1
vote
1answer
42 views

What gives dilute/conc nitric acid/ conc sulfuric acid their oxidizing property?

I know that dilute sulfuric acid and very dilute nitric acid don't have any oxidizing tendency while dilute/conc $\ce{HNO3}$ and conc $\ce{H2SO4}$ do. Why do these more concentrated acids have this ...
-3
votes
2answers
99 views

What can be used instead of magnesium to make silicon from sand (in lab)? [closed]

I found this post talking about making silicon from sand. They mixed magnesium with sand and then burn them then it create silicon and magnesium oxide. And my question is what can we use instead of ...
1
vote
0answers
47 views

A problem on Intramolecular Cannizzaro's Reaction

My textbook has the following reaction given as a special case of Intramolecular Cannizzaro reaction: As far as I understand, here one Phenyl group migrates (instead of hydride ion) from the carbonyl ...
2
votes
1answer
59 views

Regarding the oxidation of Manganese(II) ion by Peroxodisulphate ion

The following information is mentioned in my textbook: In the laboratory, a manganese(II) ion salt is oxidized by peroxodisulphate to permanganate. $\ce{2Mn^2+ + 5S_2O_8^2- + 8H2O -> 2MnO4- + ...
3
votes
1answer
89 views

What is the mechanism of temporary bleaching of flowers by SO2 ? Can H2S be used?

There are many claims on the web, explaining that the bleach action of Chlorine gas in discoloring of flower proceeds as follow and require moisture for it : $$\ce{ Cl2 + H2O <=> HOCl + HCl <=...
2
votes
1answer
83 views

Relation between standard silver-silver chloride electrode potential and solubility product of silver chloride

I learned that $E^\circ_\ce{Cl^-|Ag,AgCl}, E^\circ_\ce{Ag^+|Ag}$ and $K_\mathrm{sp}$ of $\ce{AgCl}$ are related as $$\boxed{E^\circ_\ce{Cl^-|Ag,AgCl} = E^\circ_\ce{Ag^+|Ag} + \frac{RT}{F}\ln K_\mathrm{...
1
vote
0answers
70 views

Etard's reaction

My textbook says the following on Etard's reaction: Now, if the alkyl group attached to benzene is an unsymmetrical or branched alkyl group, such as this: What will be the reaction product(s)? Which ...
-1
votes
2answers
55 views

what happens if iron clamp is attached to a copper pipe to a wall? [closed]

I'm guessing its not a good idea, since iron will then corrode easily (also depending on the location and environment), Although copper do not rust it will increase the rate of it from oxidizing. plus ...
0
votes
0answers
27 views

Sodium hydroxide reaction with manganese dioxide [duplicate]

I came across a website that said it is possible for sodium hydroxide to react with manganese dioxide at temperatures near 0 degrees Celsius. The reaction goes: 2MnO2 + 3NaOH ⇄ MnO(OH) + Na3MnO4 + H2O ...
1
vote
1answer
29 views

Why is "activity" of gaseous component equal to its partial pressure but that of aqueous component its concentration?

While solving an electrochemistry problem I had to calculate the reaction quotient of this reaction: $$\ce{2Fe(s) + 4H+(aq) + O2(g) -> 2Fe^{2+} (aq) + 2H2O (l)}$$ It turns out to be: $$\ce{Q=\dfrac{...
12
votes
3answers
2k views

Can a battery be built where several electrodes share the same electrolyte?

If you have two metals i.e. iron / copper and an electrolyte solution you can make a battery. Typically all of the designs have several of these connected in series to boost the output. But I have ...
1
vote
2answers
80 views

Redox reaction between Potassium thiocyanate and iodine

How would you balance the following redox reaction in acidic medium? $$\ce{KSCN + H2O + I2 -> KHSO4 + HI + ICN}$$ In this reaction, it seems the sulfur is being oxidized but iodine is undergoing ...
4
votes
1answer
155 views

What is the n-factor for reduction of chromate(VI) to chromium?

Here a reaction is given: $$\ce{CrO4^2- -> Cr}$$ I don't know the full reaction, but I made some estimates. One estimate was that on balancing charges we get two electrons on right-hand side. I ...
7
votes
2answers
526 views

Can hydrogen peroxide reduce ferric ion to ferrous ion?

I have studied that hydrogen peroxide always oxidizes ferrous ion to ferric ion (source of study : NCERT Chemistry Part II, Textbook for Class XI), but a question came in IIT JEE 2015 which states: ...
2
votes
0answers
66 views

Is hydrogen peroxide a better oxidizing agent than chlorine gas? [closed]

If we compare the standard reduction potentials of $\ce{H_2O_2}$ with that of $\ce{Cl_2}$: $\ce{H_2O_2 + 2H^+ + 2e^- <=> 2H_2O : E^o = 1.78V}$ $\ce{Cl_2 + 2e^- <=> 2Cl^- : E^o = 1.36V}$ (...
1
vote
0answers
28 views

Why does the application of external mechanical pressure increase the performance of lithium-ion batteries?

Many electric vehicle batteries - specifically lithium-ion ones considered for this query - can be subjected to external mechanical pressure because it increases battery performance. What components ...
0
votes
0answers
31 views

Why do we need salt bridge in a cell during potentiometric measurement as there is no or minimum redox activity at electrodes?

In electrochemical cell, we need salt bridge to maintain electrical neutrility in both halves cells during redox reaction?. But in during potentiometric measurement, no or minimum current is drawn and ...
1
vote
2answers
99 views

Hydrogen Peroxide & Vinegar Film reversal, can someone help me understand this reaction?

I'm interested in DIY photo development and I came across a reversal process that uses chemicals easily available at the grocery store. The purpose of a reversal process is to take a partially ...
0
votes
1answer
149 views

What is the n-factor of ferric sulfide when it reacts with oxygen to give ferrous sulfate and sulfur dioxide?

What is the n-factor of $\ce{Fe2S3}$ in this reaction? $$\ce{Fe2S3 + O2 -> FeSO4 + SO2}$$ I broke this reaction down into two parts $$\ce{Fe2S3 -> FeSO4}$$ $$\ce{Fe2S3 -> 3 SO2}$$ And in the ...
3
votes
1answer
134 views

Considering Gibbs energy or electrode potential to find disproportionation tendency

The following data was given (without the asterisks and footnote) asking us to find the oxidation states that would have a tendency to disproportionate - By tendency to disproportionate, I understood ...
0
votes
1answer
53 views

How is this reaction not a decomposition reaction? And are all disproportionation reactions decomposition reactions?

When I asked my teacher whether all disproportionation reactions are decomposition reactions, he stated the following reaction: $$ \ce{4 KClO3 -> 3 KClO4 + KCl} $$ and said that this isn't a ...
3
votes
0answers
54 views

Oxidising power of oxides of 15th group elements [closed]

In case of oxides of 15th group elements in form of $\ce{M2O3}$ ($\ce{M}$ is the 15th group element), does oxidising power of oxides increase or decrease down the group? I tried to check by comparing ...
0
votes
2answers
141 views

Are all hydrolysis reactions non-redox reactions? [closed]

Are all hydrolysis reactions always non redox reactions? For example: $$\ce{N2O3 + 2H2O -> 2HNO2}$$ The main reason I say that this statement is correct is because oxygen and hydrogen generally ...
5
votes
0answers
84 views

Mechanism for reaction between carboxylic acid and manganese(II) oxide [closed]

I am reading about redox reactions of carboxylic acids with $\ce{MnO}$ but I couldn't find any mechanism online,so can any one provide the mechanism.
2
votes
1answer
120 views

How to balance the reaction equation between copper (I) sulfide and nitric acid?

What is the sum of stoichiometric coefficients of redox reaction: $\ce{Cu2S + HNO3 -> S + NO2 + Cu(NO3)2 + H2O}$? This exercise is from a multiple choice exam. I have balanced the equation: $$\ce{...
1
vote
1answer
48 views

Effect of side reactions on galvanic cell using iron rod as anode and sodium chloride as salt bridge

We just made a galvanic cell on a chemistry lesson using iron, iron sulfate , copper and copper sulfate. We used a sponge soaked in $\ce{NaCl}$ solution as the salt bridge. The issue is that we ...
3
votes
1answer
180 views

Procedure for measuring EC

Most of the procedures on the internet are of a university research lab level. Is there a simpler method I could use to determine the concentration of EGCG
-2
votes
1answer
38 views

What product is created in a zinc - nitrate reaction? [closed]

Question: Place 2 mL of Nitric acid in a test tube and add a small piece of Zinc turning I thought that the overall net ionic equation would be: $$\ce{Zn + 2H+ -> Zn^2+ + H2}$$ Is this correct? ...
2
votes
1answer
50 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}...
0
votes
3answers
160 views

How does copper oxidise alcohols?

Consider for example ethanol being heated in the presence of copper at 300 °C. How does it give ethanal as a product? Copper being in its elemental state (oxidation state 0). Since negative oxidation ...
0
votes
0answers
28 views

Temperature at which the reaction Oxalic acid + KMnO4 becomes autocatalytic

As described many times, the reaction between oxalic acid and potassium permanganate can be autocatalytic due to the production of Manganese ions. I've read that this only occurs at higher ...
-1
votes
2answers
52 views

Why would electrode be positively charged in electrolysis?

From my understanding, a battery provides a driving force to pull electrons from the anode, thus the anode becomes positively charged. Suppose the anode is copper, the process should be as follows: $\...
2
votes
0answers
122 views

Will potassium permanganate react with ferric chloride?

I came across a question : Which of the following compound does not decolourise an acidified solution of $\ce{KMnO4}$? Answer was: After doing a bit of research I found that $\ce{KMnO4}$ oxidises $\...
1
vote
0answers
48 views

Comproportionation reactions

Is the following reaction a comproportionation reaction? $\ce{NH4NO3 -> N2O + H2O}$ The wikipedia definition says: Comproportionation or synproportionation is a chemical reaction where two ...
1
vote
0answers
42 views

What does the horizontal axis on cyclic voltammograms mean?

In cyclic voltammograms (like the one in the attached image) what exactly is the horizontal axis' voltage refering to? Is it the measured voltage between the reference electrode and working electrode? ...
2
votes
1answer
115 views

Does lead(II) chloride dissociate into Pb²⁺ and Cl⁻ ions in HCl?

While solving JEE Advanced 2020 (Paper 2) questions, I came across this particular question: Q.10 Choose the correct statement(s) among the following. (A) $\ce{SnCl2 · 2 H2O}$ is a reducing agent. (B)...

1
2 3 4 5
27