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.

Filter by
Sorted by
Tagged with
1
vote
0answers
6 views

Why is the electronegativity of potassium and rubidium same?

The electronegativity of potassium and rubidium is reckoned at 0.82 for both. Why is it same for both of them? Shouldn't it be less for rubidium as compared to potassium owing to the addition of one ...
-1
votes
0answers
17 views

Inorganic Chemistry Problem [closed]

Imagine a descent in symmetry from Oh to D2h. For this descent in symmetry, preserve the C2 operations that are equivalent to C42 in Oh. Determine how each Oh operation appears in the D2h character ...
0
votes
0answers
34 views

Activity of 1 M NaCl [closed]

I am quoting a sentence from this website. It said: "Thus, if γ (the activity coefficient) > 1 then ΔHkM is a positive quantity, indicating that the mixing process is endothermic." Why ...
-3
votes
0answers
44 views

Why ammonium dichromate has explosion? [closed]

Why ammonium dichromate has volcanic explosion when heated?
0
votes
0answers
32 views

The order of increasing Covalent nature in Group 12 (Zn,Cd and Hg)

Suppose $\ce{Zn}$, $\ce{Cd}$ and $\ce{Hg}$ were to form a bond with the same element; say $\ce{ZnCl2}$, $\ce{CdCl2}$ and $\ce{HgCl2}$ Then which of the compounds would be showing most covalent ...
-3
votes
0answers
45 views

Fajan rule violation in group12 [closed]

Ionic size: $\ce{Zn^2+ < Cd^2+ < Hg^2+}$ Fajan rule: Compounds are more likely to be covalent if there would be a large positive charge on the cation, the cation would be small, and the anion ...
0
votes
1answer
39 views

When is the activity coefficient greater than 1? [closed]

I am quoting a sentence from Non ideal solutions: if the interactions (between solute and solvent) repel each other, the activity coefficient is greater than 1. How can interactions between ...
-3
votes
0answers
37 views

Which resonance hybrid structure of NO2- is correct? [closed]

I saw on youtube that you could write the Lewis structure of $\ce{NO2-}$ as given in the second image where we can add the red dots on either side since both of them have an equal formal charge $(-1/2)...
0
votes
0answers
25 views

Why do the lanthanides and actinides have a 5d and 6d orbital, respectively? [duplicate]

I was taught in school that the rare earth metals were the $\mathrm{f}$-orbital group. Additionally, the Aufbau principle states that the order of orbitals based on energy levels is $\mathrm{6s4f5d}$ ...
5
votes
1answer
121 views

Analysis of cations using sodium thiosulphate

A question in an exam was as follows:[1] How many of the following salts are first soluble in $\ce{Na2S2O3}$ solution, followed by the formation of a white precipitate and finally the precipitate ...
-1
votes
1answer
72 views

Finding the chemical formula for an ionic compound made using iridium and nitrite ion [closed]

What is the most likely chemical formula for an ionic compound involving the elements iridium and nitrite? The charge on the polyatomic ion $\ce{NO2}$ is $-1$, whereas $\ce{Ir}$ is a transitional ...
0
votes
1answer
59 views

Calculating numbers of moles at equilibrium given the volume of mixture and initial concentration of reactants [closed]

The equilibrium between three substances, A, B and C Is shown below. $$\ce{A(g) + B(g) <=> C(g)}$$ Initially there were $\pu{0.1 mol}$ of A and $\pu{0.2 mol}$ of B in the reaction mixture. A and ...
-4
votes
2answers
65 views

What is the coordination number of La in LaAlO3? [closed]

I am not sure whether the coordination number of La is 8 or 12 in LaAlO3 which Al3+ cation act as cubic centre while La3+ cation locates of cubic corner. How to find the coordination number for this ...
-2
votes
0answers
36 views

Is glycine molecule a polar or nonpolar molecule? [duplicate]

Infos say that glycine is nonpolar as an amino acid but it is a POLAR molecule. what is more valid? What is the distinction between the two?
7
votes
1answer
136 views

If phosphorus trioxide is present in the atmosphere of Venus, could it not react with water to form (sufficient) phosphorous acid?

Sufficient phosphorous acid to be decomposed in the measured quantity of phosphine ? From Phosphine gas in the cloud decks of Venus: We also rule out the formation of phosphorous acid ($\ce{H3PO3}$). ...
-3
votes
1answer
45 views

Comparing acidic nature of alkali metal hydroxides [closed]

What is the correct order of acidic strengths of $\ce{NaOH}$,$\ce{KOH}$ and $\ce{RbOH}$? The solution of this problem stated that Since their order of basicity is $\ce{RbOH}>\ce{KOH}>\ce{NaOH}$...
4
votes
2answers
262 views

Do both iodine and potassium iodide turn dark in the presence of starch?

I will do a titration to standardise a solution of sodium thiosulfate with potassium permanganate solution and potassium iodide solution. My book says that when the potassium permanganate solution ...
1
vote
1answer
53 views

Why does the titanium go to the tungsten filament in the crystal bar process?

I've tried to read a report by the US atomic energy commission [1], but couldn't really find the answer, or maybe I missed it. Why is the gaseous titanium deposited on the tungsten wire/filament ...
2
votes
1answer
31 views

Differences in using molten NaCl compared to aq. NaCl in a galvanic cell having copper anode and cathode

Since we know that copper anode will release $\ce{Cu^2+}$ ion, so I was wondering whether the cathode will thicken as copper has a lower position on the electrochemical series. Based on my research, I ...
-2
votes
0answers
55 views

Reason for there being no loss of exchange energy in d^6 configuration? [closed]

I have just read about exchange energy. But I got confused over a statement. This was the paragraph: Exchange energy is approximately proportional to total number of possible pairs of parallel spins ...
4
votes
2answers
115 views

Molecular structure of iodine nonoxide

A question in an exam was as follows: Iodine reacts with ozone gas to form a dark yellow solid $\ce{X}.$ Let the number of lone pair of electrons in un-ionised form of $\ce{X}$ be $m,$ number of lone ...
-2
votes
1answer
26 views

Is Cu stable as Cu(H2O)2+ for determination on MP-AES? [closed]

I have an unknown sample of mineral which I need to dissolve in nitric acid. I need to analyze $\ce{Cu}$ from it on MP-AES. Do I need to add $\pu{1ml}$ of $\ce{HCl}$ to stabilize $\ce{Cu}$, or it is ...
-1
votes
0answers
39 views

Most stable oxidation states for Lanthanides

I've found that the most stable and common oxidation state for the Lanthanides is +3. The explanation given is that 1 electrons from the 4f orbital and 2 electrons from the 6s orbital are removed and ...
2
votes
1answer
54 views

Why does Fe(II) have electrons in the 3d subshell? [duplicate]

The electron configuration for $\ce{Fe^2+}$ in my coursebook is given as: $$ 1\mathrm s^2\, 2\mathrm s^2\, 2\mathrm p^6\, 3\mathrm s^2\, 3\mathrm p^6\,3\mathrm d^6$$ But shouldn't the $4\mathrm s$ ...
0
votes
1answer
23 views

Change of ionic packing upon crystals are pressurized

When rock salt crystal is pressurized, its FCC structure changes to BCC structure whereby coordination ratio changes from 6:6 to 8:8. At the same time packing efficiency of the crystal decreases from ...
2
votes
1answer
412 views

Can the molecule POOF exist?

Obviously, it really would be $\ce{O=P-O-F}$. Since $\ce{F-O-O-F}$ exists the $\ce{-O-F}$ part is obviously possible and the rest of it doesn't strike me as unreasonable, but whether it can actually ...
1
vote
0answers
50 views

Why is potassium permanganate paramagnetic?

$\ce{KMnO4}$ is coloured due to charge transfer spectra. As Mn doesn't have any electrons, it shouldn't be magnetic. But, according to the magnetic susceptibility value given on Wikipedia, it comes ...
0
votes
0answers
46 views

Is it necessary that all transition metal complexes with unpaired electrons will show color?

For example consider the complex ion $\ce{[Mn(CN)_6]^{3-}}$ , it is octahedral so its d orbitals will split like $\ce{t_{2g}^4e_g^0}$. I understand the basics of how complex compounds show color (that ...
-1
votes
1answer
59 views

What compounds given can oxidize Mn(2+) to MnO4(-)? [closed]

$$\ce{Mn^2+ Solution ->[reagent 'A'] MnO4^-}$$ The reagent '$\ce{A}$' can be (A) $\ce{Pb2O3 + \text{conc.} HNO3}$ (B) $\ce{K2S2O8}$. (C) $\ce{(NH4)2S2O8}$ (D) $\ce{K2SO4}$ All of the options can ...
4
votes
1answer
290 views

Is there s-character in the HOMO of dinitrogen?

State true or false: The highest occupied molecular orbital in nitrogen molecule has no s-character. The answer given is that this false. Why is it so? The highest occupied molecular orbital in $\ce{...
0
votes
1answer
33 views

Is elemental lead as toxic as lead compounds? [duplicate]

On the internet, nobody mentions about lead's oxidation state when talking about lead poisoning. I assume it's Pb(II) and Pb(IV), as chelation therapy is suggested as a treatment. Also, its ...
2
votes
0answers
30 views

Ionic radius for tetrahedral metal–ligand complexes

The ionic radii for metal–ligand complexes that are in an octahedral coordination are easy to find. I understand that when the $\mathrm{e_g}$ orbital is filled, the ionic radius increases because the ...
1
vote
1answer
34 views

What are coexistent metals?

In ACS Sustainable Chem. Eng. 2018, 6 (10), 12542–12561, I saw the term "coexistent metals", but I could not find a definition for that on the Internet. So what does it mean? Karapinar et ...
1
vote
0answers
19 views

Nickel(II) acetylacetonate crystals coming out blue

An experiment in my class has us synthesising the acetylacetonate complex from hydrated nickel chloride being added to a solution of ammonia, acetylacetone and water. The products came out pale blue, ...
6
votes
1answer
377 views

Do alkali metals react with ammonia to form hydrogen gas?

I was recently studying about s-block alkali metals and I found the following reaction: $$\ce{\underset{alkali\\ metal}{M\phantom{_y}} + \underset{solution}{$(x +y)$ NH3} -> \underset{ammoniated\\ ...
2
votes
0answers
47 views

Comparing basic strength of phosphorus trichloride and phosphorus trifluoride

I need to compare the Lewis basic strength of trihalides of phosphorus My thoughts : Since fluorine is more electronegative, the percentage of $\mathrm s$-character in $\ce{P-F}$ bonds will be lower, ...
0
votes
0answers
13 views

Is there a way to theoretically estimate the overpotential losses in a battery?

Me and my team are currently designing a battery and are looking to do some pre-experimental analysis of different battery chemistries based on their overpotential losses. I am aware of the Butler ...
-2
votes
1answer
64 views

Has a low spin tetrahedral Ni(II) complex been synthesised?

How can $\ce{Ni(II)}$ form a low spin tetrahedral compound? I was not able to find such compounds. $\ce{Ni(II)}$ will have $\mathrm {4s^03d^8}$ and tetrahedral needs $\mathrm{sp^3}$. So $2$ electrons ...
1
vote
0answers
15 views

Does anyone have experience with polycaprolactone?

I am trying to create an emulsion from polycaprolactone. My efforts thus far have resulted in unstable emulsions which sediment and coalesce after some time. This is what I have tried: Dissolve 5g of ...
-1
votes
0answers
15 views

reappearing copper stain

I left a copper pot on a wet laminate countertop. After a couple of days, there was a green-blue stain on both the pot and the counter, which none of the typical household cleaners are up to the task ...
-1
votes
2answers
41 views

Determining the formula of sodium carbonate hydrate using acid-base titration [closed]

I found this question online at mathsmadeeasy.com: Sodium carbonate exists in hydrated form, $\ce{Na2CO3 · x H2O},$ in the solid state. $\pu{3.5 g}$ of a sodium carbonate sample was dissolved in ...
0
votes
1answer
42 views

Jahn Teller Effect on Metal Complexes

I've been learning how the Jahn Teller Distortion effects the orbitals in Metal complexes and how the splitting of eg and t2g orbitals happens. But the book mentions that the effect is strong for ...
3
votes
1answer
65 views

Why did ammonium chloride fumes turned pink in this synthesis?

I was watching the synthesis of tetrasulfur tetranitride performed by Tom on his Youtube channel, Explosion & fire. He followed the basic route: adding ammonia gas to sulfur chlorides ($\ce{SCl2}$ ...
-1
votes
3answers
81 views

Oxidation state of d block elements [closed]

Why d block elements do not show +1 oxidation state ? Only copper shows +1 , whereas oxidation number starts from +3 in scandium .
0
votes
1answer
67 views

How to oxidise iron in spinach to iron(III)

I'm planning an experiment to test the iron content of spinach. I plan to ash spinach, grind it, then dilute it in a solution which would hopefully oxidise the iron ions in it to $\ce{Fe^3+}.$ This is ...
-4
votes
0answers
12 views

What is the frequency? [duplicate]

What is the frequency of green light, which has a wavelength of 4.90 x 10^-7 m? I understand how to use 3.00 x 10^8 m/s divide by 4.90 x 10^-7 m. I get 6.12. The correct answer is 6.12 x 10^14 s-...
0
votes
0answers
26 views

Arrhenius acids and bases

According to the Arrhenius definition of acids: An Arrhenius acid is any species that increases the concentration of hydrogen ions in its aqueous solution. Hydrogen Chloride gas ionises in water to ...
1
vote
0answers
20 views

The quartic electronic state of octahedral Fe(III): How make crystal field splitting diagram?

Using simple arguments from crystal field theory, how do I rationalize the quartic state of octahedral Fe(III)? I am not able to in a logical way distribute the 5 d electrons in such a a way as to end ...
1
vote
1answer
56 views

Electron configuration of iron(I) cation

What is the electron configuration of $\ce{Fe+}$ cation? \begin{align} \ce{Fe+} &\!:~ [\ce{Ar}]\mathrm{(3d)^6(4s)^1}\label{chm:1}\tag{1}\\ \ce{Fe+} &\!:~ [\ce{Ar}]\mathrm{(3d)^7(4s)^0}\label{...
-1
votes
0answers
15 views

Hybridization of Nitrogen Trichloride [duplicate]

Factually, $\ce{NCl3}$ is observed to be sp³ hybrid which might look obvious at first but upon deeper thought I feel it should be sp² hybrid because of delocalization of lone pair of Nitrogen in ...

1
2 3 4 5
77