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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Passivation of metals in acids

It is commonly taught in chemistry textbooks that metals such as $\ce{Fe, Al, Cr}$ is "passivated" in cold concentrated $\ce{H2SO4}$ and $\ce{HNO3}$ due to them forming oxide films on the ...
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Ammonium considered as metal

Why ammonium ion has very similar properties to the heavier alkali metals and is often considered a close relative? Ammonium is expected to behave as a metal ($\ce{NH4+}$ ions in a sea of electrons) ...
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Why is the pH level of carbonation loss decreasing then increases afterwards?

We have done an experiment of the titration of unsealed sprite soda to find the amount of carbonic acid being loss on various duration (0 to 1 hour), due to decrease pressure. The calculation was to ...
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BOND ORDER OF ClO2 [closed]

How do we calculate the bond order of clo2 The book that ia doing is telling that it is 1.75. In the internet I am finding answer to be 1.5 in some place and 1.75 in some other websites. What is the ...
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Why d and s orbitals overlap even when there is considerable difference in their energies?

In my grade 11 chemistry NCERT textbook, its written that hybridization happens when orbitals of almost same energy overlaps. But S orbital and D orbital have significant difference in their energies. ...
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Can fluorine act as the central atom in interhalogen compounds?

Why can't fluorine be the central atom in inter-halogen compounds? A $\ce{F-F}$ bond is weaker than a $\ce{F-X}$ bond and thus, fluorine should be happy to form inter-halogen compounds. But, why ...
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Why does boron form only covalent compounds? [duplicate]

I got two options, The size of $\ce{B^3+}$ ions, is very small and the ion has high charge density. Thus, following Fajan's rule, boron forms covalent compounds. The sum of the first three ionisation ...
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Hybridisation of cobalt in tris(oxalato)cobaltate(III)

Will the hybridisation of of $\ce{Co}$ in $\ce{[Co(C2O4)3]}^{3-}$ be $\mathrm{sp^3d^2}$ or $\mathrm{d^2sp^3}$? The question in which I found it has mentioned the answer to be $\mathrm{d^2sp^3}$ while ...
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what is the difference between valency and oxidation number? [duplicate]

I know that oxidation number is the charge any species has in its molecular or ion form. And valency is the number of electrons a species contain in its valence shell, that always tends to be used in ...
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Do superoxide salts of heavier alkali metals contradict the principle that lattice energy depends inversely on cation-anion distance?

I have a very basic understanding of quantitative lattice energy calculations: I only know that the lattice energy is directly proportional to the product of charges on the ions and inversely ...
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What would happen if the alpha particles directly hit the electrons in the gold foil in Rutherford's experiment? [closed]

What would happen if the alpha particles directly hit the electrons in the gold foil in Rutherford's experiment? Would it get ionized or is there no probability of such a thing happening ?
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Does fluoride anion ever act as a strong field ligand?

In the case of $\ce{[Fe(H2O)6]^3+}$ there are $5$ unpaired electrons as water acts as a weak field ligand. But instead of fluoride acting as a weak field ligand in the $\ce{[MnF6]^4-}$ , why does it ...
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Why is the bond angle of sulphur difluoride greater than that of hydrogen sulphide?

Why is the bond angle of $\ce{SF_2 (98.05^\circ) > SH_2 (92.11^\circ)}$? Isn't this contradicting Bent's rule or otherwise electron repulsion rule ? Fluorine is more electronegative and hence it ...
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How to compare the bond angle of ozone and nitrite anion [closed]

How do I compare the bond angle between $\ce{O_3}$ and $\ce{NO_2^-}$ ? I've studied how to compare the bond angle when normal covalent bonds are present where the electrons are shared in the bond and ...
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How to determine the equivalents of OH- in a titration curve

How does one go about determining the equivalents of $\ce{OH-}$ needed for the titration of a weak acid. For example here is the titration curve for Aspartate: Why is the equivalents for $\mathrm{p}...
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Hydrogen peroxide and glycerol combination

Is the mixing of store-grade hydrogen peroxide 3% and glycerol in the ratio of 1:2 (V/V) at room temperature affecting the decomposition rate of hydrogen peroxide?
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Does nitrogen oxide react violently with water? [duplicate]

We are going to clean an ozone generator. I understand the residue will be nitrogen oxide. When we rinse, is the mixing of water with the nitrogen oxide an exothermic or violent reaction?
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Which method has the highest yield of calcium sulfate?

I'm not sure which of following two methods will give better yields for $\ce{CaSO4}$: A. Add dilute $\ce{HNO3}$ to $\ce{CaCO3}$, followed by dilute $\ce{H2SO4}$; or B. Titrate aqeuous calcium ...
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d orbital irreducible representations in metal in ML4 model [closed]

In ML4 (Metal—4 ligands)model which has a square planar shape and D4h point group, what is the irreducible representation for the 5 kinds of d orbitals in the central metal?
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How to interpret the relation between CO stretch frequencies and backbonding strength for polycarbonyl compounds?

I am working on a series of octahedral complexes of the type $\ce{[M(CO)2(CH3)X3]-}$ where $\ce{M} = \ce{Co}, \ce{Rh}, \ce{Ir},$ and $\ce{X}$ is a range of ligands (halide, cyanide, nitrosyl, etc.). ...
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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 ...
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Is titration and neutralisation the same thing? [closed]

Is neutralization and titration the same thing for weak acid and strong base? I have seen examples of a titration where the moles of acid and base are the same, and the acid is neutralized. But then I ...
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Why is nitric acid a stronger oxidising agent than sulfuric acid? [duplicate]

We were taught that nitric acid can oxidize $\ce{Cl-}$ to $\ce{Cl2}$, but sulfuric acid cannot. Is this due to its smaller size, or structure, or what?
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Dipole moment and polarity of borazine / borazole / inorganic benzene

What is the dipole moment of borazine? I tried googling it but can't find a reliable source. I searched in JD Lee too. It might have it but I could not find.
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Why is the bond angle of trifluoromethane higher than that of difluoromethane?

The bond angle $\ce{\angle(F-C-F)}$ of $\ce{CHF_3 > CH_2F_2}$ whereas that of $\ce{\angle(Cl-C-Cl)}$ is $\ce{CH_2Cl_2 > CHCl_3}$ why is this the case? Some explanations I read suggest the Bent's ...
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Chemical test for ferrous ions

I have a reference sheet for inorganic analysis which says that the confirmatory test for ferrous ions is as follows: Make a solution of the given salt (whose cation is to identified) and add ...
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Why is it technically inaccurate to say that the decrease in reactivity of halogens is due to decreasing electronegativity?

I came across the following information in this post. Below the infographic there is a paragraph with a disclaimer: As another disclaimer, the reactivity of the halogens decreasing down the group ...
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Why does a larger bond angle correspond to greater s-character?

In trialkylamines $\ce{NR3}$, the $\ce{R}$ alkyl group attached to nitrogen increases the electronegativity of the nitrogen atom. I also found in this question that this happens due to the repulsion ...
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Can ozone oxidise iodine to periodic acid?

I noticed that the reaction of ozone with $\ce{I_2}$ gives iodic acid and not periodic acid. Upon searching, I found this question: Why does iodine get oxidized to iodic acid and not periodic acid by ...
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Which “exotic salt” can lower water's freezing point by 70 °C?

The Medium.com article Mars Phoenix Lander, 10 Years Later shows several remarkable images and discoveries on Mars by the Mars Phoenix Lander circa 2008. One image (shown below) shows what looks like ...
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What is the alloying composition of the Zinc-Platinum System?

My research team and I are working on a bimetallic alloy consisting of Zinc and Platinum. We have looked for papers regarding the composition of Zinc-Platinum alloy. But there aren't many papers out ...
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Finding the atomic packing factor (APF) of Sodium Chloride and other FCC ionic compounds

For a piece of coursework I am doing, I need to calculate the atomic packing factor of some ionic compounds. I have had no formal teaching in this area, so what I know comes from information I have ...
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Why is Electron Gain Enthalpy of only Be and Mg positive, in group 2?

While going through my book, I came across the following observation: $\Delta H_{eg1}$ is positive for Be and Mg Where $\Delta H_{eg1}$ is the first electron gain enthalpy. It seemed quite ...
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Significance of p functions in compounds of the lighter alkaline and alkaline earth metals [closed]

It is often said that lithium follows the duet rule instead of the octet rule, unlike the more "usual" main-group elements. My question is the following: Does this hold for $\ce{Be, Na}$ and ...
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Why Sn and Ge have same electronegativity? [closed]

I understand that the electronegativity remains same for Ge and Si due to presence of d orbital electrons causing poor shielding.Similarly I understand that en remains same for Pb and Sn.But I don't ...
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Explanation for why nickel turns green in hydrochloric acid

My daughter has a chemistry test that I am helping her prepare for. One question is Nickel sulfate, $\ce{NiSO4(aq)}$ is a green solution. Nickel chloride, $\ce{NiCl2(aq)},$ is a yellow solution. If ...
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Applying the Pauling's electronegativity when the ionisation enthalpy and electron gain enthalpy of an element are given

I came across the following problem while practicing some exercises on inorganic chemistry: If the ionization enthalpy and electron gain enthalpy of an element are 275 and 86 $Kcal mol^{-1}$ ...
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Why is WF6 stable whereas CrF6 is unknown?

$\ce{F-}$ is a hard base since it is small and relatively polarizable. Both $\ce{Cr^6+}$ and $\ce{W^6+}$ are hard acids, but shouldn't $\ce{CrF6}$ be favored since it would be a smaller hard acid?
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How do I calculate the ratio of acid:conjugate base in a buffering solution, if I'm given a pH and pKa value? [closed]

This is referring to the bicarbonate buffering solution in the blood and we were given a problem, where we were supposed to know the ratio of $\ce{H2CO3}$ to $\ce{HCO3-}$ at particular $\mathrm{pH}.$ ...
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Nature of a1g Molecular Orbital Interactions in Ferrocene

While learning about ferrocene I've come across this molecular orbital diagram. What particularly confused me is the nature of the a'1g orbital. My professor taught that a'1g and e2g are considered ...
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Why ordinary river sand does not cause alkali-silica reaction in cement etc? [closed]

Glass contains amorphous silica and the alkali silica reaction happens in cement. But why does the same thing not happen with the ordinary river sand? isn't that the same silica? as I know river sand ...
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Confused about what to put as the x, y in the picture regarding chemical kinetics

I don’t understand what I should put as the x, y...I drew...is it a stechiometric coefficient or an order number? The pictures seem conflicting to me. Am I getting something wrong?
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How can we extract alkali metals from their salts? [duplicate]

In my text book, they have written that we can extract them by doing electrolysis of fused halides. But I am not able to find more in-depth detail of this process.
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How can AuCl3 exist?

The reduction potential for $\ce{Au^3+ + 3e- -> Au}$ is $1.503 \text{ V}$. The reduction potential of $\ce{Cl2 + 2e- -> 2Cl-}$ is $1.36 \text{ V}$. So, the $E^o$ for $\ce{2Au^3+ + 6Cl- -> 2Au ...
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Why are f-f transitions spin forbidden? [closed]

I know that f-f transitions in lanthanides are Laporte and spin forbidden but I don't understand why they are spin forbidden actually... I tried to write it down on a paper but I didn't manage to ...
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Electrochemical etching of silicon

I am doing some research on porous silicon in electrochemical biosensors. I have come across the electrochemical etching method to produce porous silicon for the biosensors. I have also come across ...
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What is the best way to check the solubility of inorganic salts? [duplicate]

In a theoritical manner like some salts when given for comparison Does we are having any rules for general solubility of salts? Or the best theory ?
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How can I prove ascorbic acid degradation with Uv-vis spectroscopy?

I have to prove scientifically why a sodium ascorbate solution in water turns yellowish - reddish over time. I know ascorbic acid is supposed to oxidize into dehydroascorbic acid, and the latter then ...

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