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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Products of silicate synthesis

I'm attempting to make a hard refractory cement to apply over kiln brick made of sodium silicate and Perlite. This creates a very good kiln brick, however they are susceptible to abrasion. I've been ...
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Mixing cobalt(III) hydroxide and thallium(III) hydroxide

A simple question on solutions is driving me crazy. At this point, I think the textbook's wrong. Here's the question: A saturated solution of cobalt(III) hydroxide $(K_\mathrm{sp} = \pu{1.6e-44})$ ...
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261 views

Why is chromate stable in basic medium and dichromate stable in acidic medium?

When I was studying the equilibrium existing between chromate and dichromate ions in the solution, I came to know that Chromate ion is more stable in basic medium while dichromate ion is stable in ...
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Reaction of copper with nitric acid

$\ce{Cu}$ reacts with $\ce{HNO3}$ though $\ce{Cu}$ cannot replace $\ce{H}$ due to its less reactivity. Then, why does it react with $\ce{HNO3}$?
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Xe compounds - without O or F

I may be wrong, because this is purely based on observation-Is it true that Xe does not form compounds without O or F? If yes, could you please elaborate the reason behind it? (I have a basic ...
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Why does hydrogen have a lower ionization energy than fluorine?

I found here that the ionization energy of hydrogen is $\pu{1312kJ/mol}$ and for fluorine, it is $\pu{1681kJ/mol}$. Now clearly, from the data, we can see that hydrogen has a lower ionization energy ...
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The color of the most sulfides of p- and d-block elements

My teacher said that many of the sulfides of d-block and p-block are black. Why?
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Why doesn't PH5 exist? [duplicate]

I have a basic understanding of VBT, hybridisation and VSEPR. However, I still can't come up with a reason as to why $\ce{PH5}$ doesn't exist while $\ce{PH3}$ and $\ce{PCl5}$ do. Can anyone please ...
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Order of stability of allotropes of phosphorus

I want to know the stability order of allotropes of phosphorus. Upon searching I realised that two types of stabilities are defined in their case kinetic thermodynamic But I am somewhat confused (...
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1answer
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How to get or understand a sample in chemistry without knowing its chemical name or compound or formula [closed]

How to get or understand a sample in chemistry without knowing its chemical name or compound or formula? I was thinking about whether there is a way to understand what the chemical compound sample ...
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781 views

How to find the combining valence of an anion when it exhibits variable valency?

I'm doing an online course and can't for the life of me figure out how to write chemical formulas from the chemical name. Take the example of calcium chloride. I know the the valence for calcium is ...
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Why does Tin form Sn+2 in an acidic medium, not sn+4? [closed]

As sn+4 is more stable than sn+2 it should form sn+4! Answer of this question is 2
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Lewis structure of R-COO-Na+ [closed]

I am studying Lewis structure and I have a question about an excercise. The question asks what is the Lewis structure of $\ce{R-COO^-Na+}$. I don't know how to draw it correctly.
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Parallel between polarisability of donor atom and crystal field split strength

Observing the strength of crystal field splitting by different ligands, I drew up the following: Most of the members in the series are ligands where the donor atom is nitrogen, oxygen or carbon. If ...
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40 views

Why cupric ion oxidises iodide to iodine

I have learnt in the qualitative analysis of cupric ions that upon treating its aqueous solution with excess $\ce{KI}$, triiodide ions are formed which can be further tested using starch. The ...
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1answer
31 views

Formation of Goethite

Probably a simple question: When you're mixing potassium hydroxide ($\ce{KOH}$) with iron nitrate ($\ce{(FeNO3)3}$) to form ferrihydrate, does the temperature have to be below $\pu{60 ^\circ C}$?
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Comparing bond angles in carbonyl dichloride and carbonyl dibromide

Background I was studying VSEPR and hybridization theory and one of the popular questions in many textbooks was comparison of bond angle of $\ce{NH3}$, $\ce{NF3}$ and $\ce{NCl3}$. $\ce{NF3}$ had ...
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Is Hydrogen Dioxide Water? If so, what is the chemical compound and differences between H2O and H2O2? [duplicate]

Four of us were debating what the actual compounds and terms (scientifically) for water. H2O we all agreed upon until one person said, "..yes and its Hydrogen Dioxide". Myself and 1 of the four ...
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Reaction of phosphorous pentachloride and sulphur dioxide [closed]

I came across this Reaction of $\ce{PCl5}$ and $\ce{SO2}$ which gives $\ce{POCl3}$ and $\ce{SOCl2}$. And I found this reaction to be interesting because of the fact that two gases are reacting with ...
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2answers
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How to find the stoichiometric amount of nitric acid reacting with tin?

To find the amount of $\ce{HNO3}$ behaving like an acid in the reaction $$\ce{Sn + HNO3 -> Sn(NO3)2 + NH4NO3 + H2O},$$ I first balanced the reaction using oxidation number method which gave me $$\...
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1answer
49 views

Hydrolysis of magnesium boride

Does magnesium boride react with water to form boranes? My attempt: Magnesium nitride reacts with water to form ammonia and magnesium hydroxide. Similarly, does magnesium boride also react with water ...
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1answer
249 views

Trends in solubility of group 2 nitrates

In my lab report, we are required to explain the trends in solubility of group 2 salts, going down the group. I had explained all of the trends except one, group 2 nitrates. The following is the data ...
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Conducting cyclic voltammetry in an air sensitive manner

Does anyone have suggestions on ways to conduct cyclic voltammetry on an air sensitive material without shipping the entire set up into a glovebox? This is for redox active organometallic compounds.
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Why do some hydrate salts form monohydrate on heating? [closed]

Some hydrate salts like washing soda ($\ce{Na2CO3.10H2O}$) when heated lose all but one water of crystallization. How is the force holding the last water of crystallization different from the other ...
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Question about octet law and elements [closed]

Which is the list of all elements that work the octet rule ? i´ve been estudying abot lewis structure.
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519 views

Why is Aluminium oxide amphoteric?

I was reading my book, in which it mentioned that aluminium and gallium oxides are amphoteric and and indium and thalium oxide are basic in their properties. But no explanation was given. My main ...
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How to predict the products of an inorganic dehydration reaction?

For example, this reaction, is a dehydration reaction $\ce{ HNO3+ P4O10 -> N2O5 + HPO3} $ If I were only given the reactants side of the equation, how would I predict the products side of it? What ...
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1answer
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What type of bonding is there among d-block metals?

Metallic bond strength in $\mathrm{d}$-block elements increases up to the middle and then decreases. Why does pairing decrease the strength of metallic bond? What does pairing have to do with metallic ...
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Inorganic chemistry - please suggest! [duplicate]

Can any one suggest a book of inorganic chemistry that has a lot of problems? Both Mcqs and subjective questions should be there. And the textbook should also be useful for chapters about reactions ...
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1answer
686 views

Comparison of C-Cl bond length in CH3Cl and CF3Cl

How can one compare the $\ce{C-Cl}$ bond lengths in chloromethane ($\ce{CH3Cl}$) and chlorotrifluoromethane ($\ce{CF3Cl}$)? Bent's rule is also consistent with Gillespie's VSEPR model, and may ...
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1answer
210 views

Negative oxidation state

Why doesn’t aluminum have negative oxidation states? In almost all compounds of aluminum which I know of has positive oxidation state. It has valence EC [Ne] 3s2 3p1 , my teacher told it usually ...
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1answer
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Why does magnesium have an exceptionally low melting point?

Why does magnesium have a lower melting point than both calcium and beryllium? It does not seem to fit into the group trend.
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1answer
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Separating sodium sulfate from chromium trioxide solution

I was looking at the industrial process for the production of chromium trioxide by treating sodium chromate or the corresponding sodium dichromate with sulfuric acid. This results in the formation of ...
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Is tin and tinware toxic?

I tried to find info on tin toxicity but there is not much. Wikipedia here says that it is not very poisonous; but there could be cases. My question is: is it dangerous to say have a coffee boiled ...
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2answers
468 views

Can you turn lead dioxide into lead?

I've read that you can reduce lead oxide to lead by heating it with carbon. Does this also work with lead dioxide? I took apart an old lead-acid car battery and realised then, that there are almost ...
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1answer
60 views

Why is phosphorous pentoxide a dehydrating agent?

$$\ce{HNO3 + P2O5 -> 2HPO3 + N2O5}$$ In this reaction, both nitrogen and phosphorus have the same oxidation number before and after the product is formed. Since the $+5$ oxidation of nitrogen is ...
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Electronic Configuration of Lanthanum [duplicate]

Lanthanum has electronic configuration [Xe] 4f0 5d1 6s2. Why is the 4f sub-shell not filled even though we know that 4f is filled before 5d subshell? I know that for some elements energy level of 4f&...
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Catalysts and activation energy

Do catalysts increase rate of reaction only by decreasing activation energy? Or can they affect the Arrhenius factor or reaction orders? Like if one catalyst is more effective at increasing rate of ...
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Can the unshared electrons present in D block metals can be considered as lone pairs?

Having doubt,how to decide whether an unshared pair of electrons is lone pair or not.. Another doubt I have is that VSEPR theory states that the lone pairs influence shape of compounds..do the same ...
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1answer
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What substance has the lowest solubility product?

What substance has the lowest $K_\mathrm{sp}$ and what is its value? The lowest I could find is $2.6\cdot 10^{-124}$ for cobalt(III) sulfide $\ce{Co2S3}$.
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Why does an mercury ore exist as HgS?

Cinnabar($\ce{HgS}$) is one of the most common ores of mercury. Why does it not exist at $\ce{HgO}$ or some other such compound? Is there any reason for why it is so prevalent? Does it react less ...
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1answer
55 views

Salt analysis of Ag salts

So I was doing analysis of Ag salts and I found Agbr is curry white partially soluble in ammonia , AgI is yellowish and insoluble . BUT silver phosphate is also yellow . So can anyone tell whether or ...
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Crystal Field Theory

When I learned about crystal field theory I had fallen on a paradox. When K4[Fe(CN)6] is formed then three d orbitals are occupied by electrons of Fe2+ pairly and the rest two d orbitals are occupied ...
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1answer
51 views

Why is polonium tetrafluoride non-existent?

I learnt that the group 16 elements can form halides, but with the exception that polonium cannot form a tetrahalide with fluorine. However, I thought that it was possible. This is because the ...
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1answer
47 views

Why does this ligand form 6-coordinate complexes with Transition elements and 8-coordinate complexes with Inner transition elements? [closed]

What change takes place in the denticity of this ligand if it is an inner-transition metal ion vs a common transition metal? Primarily, why does the ligand behaves differently with the two situations ...
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2answers
873 views

Why ammonium hydroxide precipitates metal salts?

When I was going through the chapter on pnicotgens, I got to know that ammonia acts as a Lewis base and it dissociates in water giving out hydroxide ion and the further hydroxide of ammonia, which we ...
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Why B2H6 is hypovalent [closed]

In the book it was given that Boron is below octet in B2H6. But I have a doubt, that the electrons of the 3c-2e bond are shared by two boron and one hydrogen atom at a time. Therefore each Center(2B ...
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1answer
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What grade of sodium fluoride is needed for preservation of urine for drug and alcohol testing?

We are preparing DUI test kits and the distributor we purchased our sodium fluoride vials from is no longer in service. We are having difficulty finding a new supplier. Would food grade work for ...
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1answer
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Potassium tetraoxalate preparation [closed]

How is potassium tetraoxalate produced industrially? In fact How I can limit the reaction of $\ce{H2C2O4}$ and $\ce{KOH}$? Or is there any other route for this purpose?

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