Questions tagged [inorganic-chemistry]

Inorganic compounds generally do not have C-H bonds, while organic compounds do have such bonds. The distinction between inorganic and organic chemistry, however, is far from absolute.

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Do d-orbital electrons shield each other or not?

"The shielding of one 4f electron by another is less than that of one d electron by another, and as the nuclear charge increases along the series, there is fairly regular decrease in the size of ...
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1 answer
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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}...
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1 answer
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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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Why is Europium(ll) a good reducing agent?

Eu in ground state has 4f7 5d0 6s2 configuration while it has 4f7 5d0 6s0 in +2 oxidation state, which has the stable configuration of d5. Then why is it so, that Eu2+ still gets oxidised itself (to ...
1 vote
1 answer
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Redox titrations : Oxidation of metallic Iron by Potassium Dichromate

$\pu{0.31 g}$ of an alloy of $\ce{Fe + Cu}$ was dissolved in excess of diluted $\ce{H2SO4}$, and the solution was made up to $\pu{100 ml}$. $\pu{20 ml}$ of this solution required $\pu{3 ml}$ of $\frac{...
2 votes
1 answer
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Smell of orange peel travels super fast

Many years ago, my college chemistry teacher squeezed an orange peel in the front of the auditorium asking us to raise our hands when we smelled it. Hands rippled through the auditorium (at least 40 ...
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2 answers
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Is it possible to make thermite that detonates?

Why does thermite burn pretty slowly? Can it burn much faster if the components were ground to much smaller grain sizes? Can it be made to actually detonate--that is, the entire pile turning into ...
2 votes
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What is the oxidation state of the two tin bonds in the below structure?

I understand that typically, ethylene as a ligand has a neutral charge and would not contribute to the oxidation state of the transition metal bound to it. However, I am seeing conflicting information ...
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1 answer
607 views

Only valence shell electrons participate in bonding then how is Cr in H2CrO4 forming 6 covalent bonds although it has only 1 valence electron?

The structure of $\ce{H2CrO4}$ is as follows: Shell configuration of chromium is 2,8,13,1 i.e. it has only 1 valence electron and only valence electron participate in bonding but Chromium in the ...
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2 answers
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What is the precipitate of this reaction of magnesium?

$\ce{MgSO4}$, on reaction with $\ce{NH4OH}$ and $\ce{Na2HPO4}$, forms a white crystalline precipitate. Identify the precipitate. My approach: I guess the white crystalline precipitate is $\ce{Mg(OH)2}...
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Reaction NaClO + pre-mixed joint compound (drywall mud)?

Objective: Prior to long-term storage, provide some level of inhibition to microbial growth (i.e., to replace hypochlorite lost from the initial factory preparation). Assume a reasonable dilution of ...
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1 answer
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Melting point order of HF, NH3 and H2O [closed]

What is the correct order of melting point order of $\ce{HF, NH3 and H2O}$? I am really confused because my notebook says: $\ce{HF < NH3 < H2O}$, whereas some websites I visited said: $\ce{NH3 &...
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Please someone tell me correct answer for the question below [closed]

A solid sample X contains the compounds P, Q and an inert substance. Here P = Fe2O3 and Q=Fe304.Q is a single compound and contains iron in Fe2+ and Fe3+ oxidation states. It reacts with I- in an ...
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1 answer
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D-d splitting in transition metal ions

Cu+2 ion has total of 9 electrons in its 3d orbital. When it undergoes d-d splitting an electronic transition can take place between t2 and e as in {Cu(CN)4}-2 complex because of the presence of one ...
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1 answer
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Reaction of Metallic Tin with NH4Cl and treatment with Sulfur

Metallic $\ce{Sn}$ is reacted with $\ce{NH_4Cl}$ and the resulting solution is treated with Sulfur. What is the gaseous product? What is the color of final precipitate? The above resulting solution ...
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How separate copper from pieces of nickel [closed]

i have hundred small pieces of nickel with layer of copper on them. How can i get the copper layer from nickel? Thank you!
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1 answer
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Store Palladium Chloride in Solution

I have one gram of palladium chloride ($\ce{PdCl2}$) and I want to use very small quantities of it, in milligrams somewhere. It is not possible for me to get my hands on a scale that can measure that ...
3 votes
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How to regenerate indium wires for vacuum seals?

I have a setup consisting in a vessel that eventually gets at low temperatures (approximately 85K - 87K) and needs indium wire as sealant. Unfortunately, we have to frequently open and close this ...
2 votes
1 answer
388 views

Chlorine monoxide formation

In World War 1, the chlorine gas was handled by some soldiers by damping their hankerchiefs into sodium carbonate solution. The article chlorine monoxide suggests that the reaction release chlorine ...
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1 answer
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How can I find the number of ions based on conductivity? [closed]

I’m asking based on Werner’s theory on Pt complexes. This question came up whilst I was studying inorganic chemistry.
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3 answers
14k views

Reaction of concentrated nitric acid react with metallic lead?

Here is my work: Concentrated $\ce{HNO3}$ should first decompose into $\ce{NO2}$, $\ce{H2O}$ and $\ce{[O]}$. Nascent oxygen should combine with $\ce{Pb}$ to form $\ce{PbO}$. Now $\ce{PbO}$ should ...
4 votes
2 answers
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Pt[BrCl(PR₃)₂] cis, trans isomer nmr - Which is cis and which is trans?

The two square planar isomers of $\ce{Pt[BrCl(PR_{3})2]}$ have different $\ce{^{31}P}$-NMR spectra. One shows single group of lines, the other shows two distinct resonances, each one being similar to ...
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Why does the nitrito ligand have a higher Δo than water in the spectrochemical series?

I collected some data to determine the value of $\Delta_\text{o}$ for a some transition metal complexes (attached) and I'm very confused as to why $\Delta_\text{o}$ for the $\ce{ONO-}$ ligand is ...
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Multiplicity and signals of cis−[(Ph3P)2PtF2] in two NMR spectra

I am interested in the number of the signals and their multiplicities in the $\ce{^{31}P\{^1H\}}$ and $\ce{^{19}F\{^1H}\}$ NMR spectra of $\ce{[\textit{cis-}(Ph3P)2PtF2]}$. It is given that $\ce{Pt}$ ...
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Safety of lye mist?

Lye solution(NaOH) has been shown to absorb carbon dioxide from the air. It reacts with carbon dioxide to form water: $$\ce{2 NaOH + CO2-> Na2CO3 + H2O}$$ The sodium carbonate produced then reacts ...
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2 answers
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How do ions conduct electricity? [closed]

I mean to ask what do ions actually do while conducting electricity? Do they simply take up the electrons and transport it? If it is so, I do not understand how anions can take up more electrons if ...
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1 answer
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Would ferrous ion give the flame test?

My question to ask is "Does $\ce{Fe^2+}$ ion give flame test?" Background: Last month, I gave the JEE exam and a question was as follow: Number of metal ions characterized by flame test ...
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How are oxidation states of bioinorganic molybdenum/tungsten complexes determined?

Here a screenshot from our lecture on bioinorganic molybdenum complexes, dealing with the catalytic cycle of xanthine oxidase: It is said that the only biologically relevant oxidation states of Mo ...
2 votes
2 answers
565 views

Does boron exhibit +1 oxidation state?

My teacher told that boron exhibits only a $+3$ oxidation state, but he also wrote the unbalanced reaction $$\ce{B + C -> B4C}.$$ Carbon has greater electronegativity than boron leaving us with $\...
3 votes
1 answer
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Why are Mo(NR2)3 complexes isolobal with the nitrogen atom in N2

In a Molybdenum complex of the form Mo(NR2)3, the Mo is in the oxidation state of +3, leaving it with 3 d electrons. When combined with an additional 2*3 electrons from the ligands, this leaves it ...
4 votes
3 answers
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The difference between hydroxide and oxyhydroxide

I cant discern these two terminologies. Would someone be very kind to help me on it? I think hydroxide mean M(OH)x where M is a metal ion, while oxyhydroxide means something like MO(OH). Is that ...
2 votes
2 answers
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In an unsaturated solution, is the product of ions still equal to Ksp?

Suppose I have a solution of a sparingly soluble compound, and consider its solubility in g/L. If I have less g/L of solution than that amount, it means the solution is unsaturated, but what happens ...
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1 answer
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Colour of coordination compounds due to d-d transition

Hexaaquanickel(II) is green but tetracyanidonickelate(II) is colourless. On internet I found two explanations. One used valence bond theory that claimed there is no excitation of electron in ...
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Intersystem crossing

A lignad with absorption at 430 nm are reacted with Zn2+. and the emission was red (590 nm). I want to know what causes this red emission? what types of energy transfer happended between the Zn2+ ions ...
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Why exactly does copper have a higher melting point than zinc? [closed]

It is said that copper has a higher melting point than zinc because of the d electrons in copper being involved in metallic bonding. However, copper has no unpaired electrons in its d subshell just ...
18 votes
3 answers
13k views

What exactly happened when I added KOH to hydrogen peroxide?

I recently added a potassium hydroxide, $\ce{KOH}$, pellet to a small droplet of hydrogen peroxide (30 %), $\ce{H2O2}$. You could clearly see the potassium hydroxide dissolving in the droplet when ...
1 vote
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Estimation methods for temperature evolution of a high $\Delta H_{mix}$ dilution ($\ce{KOH}$ in water)

Question up front: Can temperature evolution in solutions be short-hand-estimated by simple state based calculations - with reasonable expectations of precision? (+/- 10° C) I am trying to calculate ...
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1 answer
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Why mono and dioxides of germanium,tin and lead are amphoteric

I get that group 14 elements show +4 and +2 oxidation states so they can form both ionic and covalent compounds and so they are amphoteric but monoxide means that these elements have to show +2 ...
1 vote
1 answer
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The effects of acetic acid on porous concrete brick and mortar joints

I mistakenly applied a patio cleaner containing acetic acid to my porous concrete facing brick thinking it was biocide. The concentrate solution has a pH of 3 and I diluted it to one part concentrate ...
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2 answers
350 views

What is the hydrated diameter of a lithium ion?

When salts dissolve in water, the anions, cations, and strongly polar water molecules undergo hydration reactions, resulting in the formation of hydrated ions with a specific number of coordinated ...
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Is there a way to prevent oxidation of stannous chloride in solution?

I am having trouble keeping stannous chloride from precipitating in a solution of water and I am wondering if putting a layer of oil would prevent oxidation.
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1 answer
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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: $$\ce{Cr2O7^2–(aq) + HNO2(aq) –> Cr3+(aq) + NO3–(aq)}$$ Solution (in Swedish) $$\ce{\overset{+VI}{Cr}_2O7^2–(aq) + H\...
2 votes
1 answer
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How do I find the amount of moles from the amount of units?

The problem: Find out the amount of moles of a certain substance knowing that the amount of units of said substance is $\pu{1.8E23}$. I have to find how many moles of carbon, hydrogen, and oxygen that ...
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Why do the carbonyl oxygens in EDTA not participate in coordination?

I recently had two, very brief lectures on coordination compounds. In those lectures, my teacher mentioned EDTA because of its importance in analytical chemistry and its very stable complexes and ...
1 vote
2 answers
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Bubbling air through hydrochloric acid to generate HCl gas

I am trying to build a system to generate dry HCl gas. I was wondering if you bubble air through diluted HCl will it produce a gas with mostly water vapor or HCL vapor, can we vary the proportions of ...
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Do scandide, lanthanoid and actinoid contraction increase the electronegativity of the following p-block elements?

The scandide, lanthanoid and actinoid contraction affects many periodic properties of the p block elements that come after them, like their size etc. But do they affect the electronegativity also? ...
1 vote
1 answer
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Transition of electrons between t2g and eg to give colour of coordination compounds

In the case of a hexaaquairon (III) complex, the iron (III) ion has 5 electrons, each singly occupying one d orbital. As the d orbitals are occupied, the vacant 4s, 4p and 4d orbitals are hybridised ...
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1 answer
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In heating of nitrous acid, why does oxygen react with HNO2 again? [closed]

My teacher didn't elaborate and said that HNO3 is better than HNO2, and i may have missed something he said earlier... Can anyone help? If someone is looking for the equation its here - I) 2 HNO2 ----&...
-1 votes
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Electronic configuration for +7 oxidation state in halogens (Third excited state) [closed]

In my text book, NCERT Chemistry Part 1 for class 12, the electronic configuration of the third excited state of halogens has three electrons in the ns subshell. Can someone explain how that works?
2 votes
1 answer
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Composition of a typical printed circuit board (PCB)?

For the purposes of x-ray absorption, I'm trying to discover the average chemical composition of a typical PCB. My research so far has indicated that the most common type of PCB is designated FR-4. ...

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