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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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Using significant figures to imply the stated error

The question reads; Express each of the following quantities, using significant figures to imply the stated error. (a) 3.6965 p/m 0.02 (b) 25600 p/m 10 (c) 56200 p/m 100
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Precipitation of AgCl from the tap water solution of the group 2 chloride

I had this question about an experiment where the group 2 chloride was dissolved in distilled water and excess $\ce{AgNO3}$ was added to the solution to form $\ce{AgCl}$ precipitate. One of the sub-...
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Types of reactions

What type of reactions can CH3-CH2-O-CH=O, CH3CH2NH+ OH, and each radical product from CH3CH2NH + OH undergo? I am lost on how to answer this question, I guess any help on it would be great!
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33 views

Why this redox equation occurs on basic medium?

I have the following redox equation that I need to balance: $$\ce{MnO4-(aq) + SO3^2-(aq) → MnO2(s) + SO4^2-(aq)}$$ The problem says that it happens on basic medium, but I don't see the $\ce{OH-}$ ...
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0answers
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Analysis of a mineral sample containing pyrite [on hold]

A mineral of a process contains $90\%$ $\ce{FeS2}$ and $10\%$ inerts by weight. This material is calcined with $25\%$ excess air according to the reaction: $$\ce{FeS2 + O2 → Fe2O3 + SO2}$$ ...
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Why do aromatic compounds have an upfield shift upon coordination to metals?

Why do aromatic compounds have an upfield shift upon coordination to metals e.g. ferrocene? The 1H NMR shows a single environment at ~4.1 ppm. This is in contrast to the usual aromatic shift of ...
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3answers
46 views

Why sp3 hybridisation in NH3 but bonding with pure p orbitals in case of other hydrides of group 15

According to my book, the following line was given relating to the bond angle in Group 15 elements The bond angle in PH3, AsH3 and SbH3 is close to 92° which suggests that the orbitals used for ...
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1answer
196 views

Why BiCl5 isn't stable?

I read this in a textbook: $\ce{Bi(V)}$ is very unstable and is a good oxidizing agent. Why does it happen that way? Is it because in $\pu{+5}$ oxidation state $\ce{Bi}$ pulls in more electrons ...
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1answer
58 views

Applications of magnesium sulfate monohydrate MgSO4 · H2O

How is magnesium sulfate monohydrate $\ce{MgSO4 * H2O}$ used for in chemistry and how does it work as a valuable laboratory drying agent? I could not find too much information in my book or the ...
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2answers
56 views

How can I precipitate nitrate in the water? [on hold]

I have aquariums and there is nitrate in the water, that's why we have to change the water. Would it be possible to precipitate the nitrate out?
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0answers
27 views

Features of sodium azide decomposition [on hold]

Does the gas generated from a combustion or thermal decomposition like sodium azide has the same temperature as the temperature of the reaction itself? And what stable temperature is the gas from a ...
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What are the things that are used by different kinds of fire extinguisher to keep oxygen away from the fire [on hold]

Please tell me about the things that are used by different kinds of fire extinguishers to keep oxygen away from the fire
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0answers
18 views

Why does NO prefer oxidation at lower temperature to give NO2 [on hold]

Oxidation of compound at higher temperature is favorable condition but NO prefer oxidation at lower temperature to give NO2
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2answers
52 views

Questions on Neutral oxides

Neutral oxides, are non metal oxides which are neither acidic nor basic. I have noticed a pattern for neutral oxides which I am unsure actually holds true. $\ce{CO}$, $\ce{H2O}$, $\ce{NO}$ and $\ce{...
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0answers
24 views

What is the difference between exhaust cement to furnace cement

Exhaust cement and furnace cement appears to have,more all less,similar properties.Them both based on sodium silicates which resist high temperatures. I assume that they are not made exactly the same,...
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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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2answers
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Determining the formula of zirconium oxide

I am doing the following question (from the 1988 HSC Chemistry paper): In the 19th Century the atomic weight of zirconium (Zr) was known but there was considerable doubt about the formula of ...
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1answer
36 views

why does only barium hexa aluminate gets formed ?why not octa or tetra? [on hold]

We are researching on uses of barium hexaaluminate as catalyst. Why does barium react with alumina to get only hexa product , why doesn't it react to form products like barium octa aluminate?
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Ways to prevent corrosion [closed]

What is the metal that gives an iron piece the best cathodic protection from corrosion?
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1answer
51 views

How to calculate the volume or mass of carbon dioxide gas absorbed by a calcium hydroxide solution?

Carbon dioxide reacts with calcium hydroxide as shown by the equation: $$\ce{Ca(OH)2 (aq) + CO2 (g) -> CaCO3 (s) + H2O (l)}$$ A solution containing $\pu{0.1 mol}$ of calcium hydroxide reacts ...
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0answers
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Pourbaix Diagram [closed]

If I have the Pourbaix diagram for Sb, how can I determine the low oxidation state and the species (pH range) and the high oxidation state and the species (pH range) ?
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1answer
48 views

What is the oxidation state of bromine in BrO3?

I came across this compound $\ce{BrO3}$ in my textbook, and was trying to find the oxidation state of bromine. This is how I proceeded: Since this is not a superoxide or a peroxide, or any other ...
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1answer
42 views

Rate of hydrolysis of silicon tetrahalides

Concise Inorganic Chemistry for JEE(Main and Advanced) by JD Lee(Third Edition) writes If we compare the rate of hydrolysis for $\ce{SiX4}$(where X= F,Cl,Br,I), it is in the same order as that of ...
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1answer
69 views

What alkali and alkaline earth metal oxides will turn moist red litmus blue and finally white? [closed]

How many of the following will turn moist red litmus blue and finally white? $\ce{Li2O}$, $\ce{KO3}$, $\ce{RbO2}$, $\ce{Cs2O2}$, $\ce{BeO}$, $\ce{MgO}$, $\ce{BaO2}$, $\ce{SrO}$. Since bleach ...
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1answer
46 views

Which atom bears the negative charge in cyanide? I am confused by the MO diagram

In heteronuclear species, whichever atomic orbital a molecular orbital is closer to in energy contributes more to that molecular orbital, right? In other words, if the orbital is occupied, more ...
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1answer
53 views

How do I interpret characters that are not 1 or -1 in a point group table?

When the character in a point group table is listed as 1 or -1, I understand how an object/orbital etc. transforms to give either itself or the negative of itself. When the character in a point ...
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0answers
17 views

Periodic table D-block Element [closed]

So I have been reading about D-Block element and I have come across Hafnium and Zerconium. I know that both have almost same properties. But my question is how relativistic effect play important role ...
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1answer
24 views

How can an electron sheild another electron of the same subshell?

While I was preparing for my upcoming exams, I stumbled upon this sentence which is bothering me quite a bit: The contraction of the lanthanoids is due to the imperfect shielding of one electron by ...
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3answers
63 views

Why is graphite brittle?

Carbon exists in more than one allotropic forms, and the allotropes have different physical properties due to different arrangement of atoms. I am going to compare their hardness for now. Below is ...
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2answers
40 views

Balancing simple redox reactions [closed]

I really need help with balancing redox reactions. I understand the theory and can balance simple reactions by half reactions but when it comes to some more complicated ones I cant seem to get it ...
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1answer
23 views

Lewis structure of ammonium ion [closed]

What would be the lewis structure for ammonium ion? Is there a coordinate covalent bond as well in the structure? My confusuion would be dealth with if i get the structure of ammonium cyanate as well....
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0answers
42 views

Why ionisation enthalpy of early lanthanides are expected to be greater than early actinides?

In my book Chemistry Part I (NCERT XII), a statement on p. 232 goes like this: It is evident from the behaviour of the actinoids that the ionisation enthalpies of the early actinoids, though not ...
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3answers
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Are risks (hexavalent chromium) during Chrome plating temporary, or remain with the product?

Since some chrome plating production processes generate hexavalent_chromium compounds, which are reportedly highly toxic/carcinogenic, I wonder: Do the hexavalent chromium substances only occur (...
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1answer
37 views

Aqueous copper and how it reacts with NH3

I have learnt that you can test whether an unknown metal is copper by doing a simple test tube reaction. The reaction involves adding aqueous $\ce{NH3}$ to the test tube which contains the copper. ...
3
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2answers
128 views

Is Fe(OH)2 soluble in alkalis?

I have just started inorganic chemistry in school and I have just learnt about metal aqua ions and how they react in water. I learnt that $\ce{[Fe(H2O)6]^2+}$ reacts in water by losing a $\ce{H+}$ ...
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0answers
54 views

Freezing point depression of salt solutions

I have recently come across this particular equation which is used to estimate the freezing point depression of a salt solution: $$\theta_\mathrm{B} = \frac{\Delta H^\mathrm{fus}_{0,T_\mathrm{F}} - ...
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1answer
18 views

Can a half-reaction be oxidation if it has the higher reduction potential?

I am working on a problem that provides these two half-reactions: $$ \begin{align} \ce{Fe^3+ (aq) + e- &-> Fe^2+ (aq)} &\quad E^\circ_\mathrm{red} &= \pu{+0.77 V}\\ \ce{S2O6^2- (aq) + ...
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Coal, once burned creates many substances. How to separate?

Could we expose the smoke to different substances reactive to substances in the smoke, that will create a liquid or solid substance, in order to separate, for instance carbon monoxide, from the ...
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0answers
42 views

Is there a stable and non-toxic hydro-nitrogen-oxygen compound that's liquid in room temperature?

Is there a stable (i.e. does not turn into other substance when stored in a bottle exposed to the elements or explode/combust spontaneously or under mechanical impact) compound that contains just $\...
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0answers
26 views

ionisation isomers [closed]

With ionisation isomers, how do you know which ligand (out of $\ce{Br}$ and $\ce{NH3}$ for example) exchanges with the compound outside the bracket?
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2answers
62 views

Rate law equation - orders?

Consider the following reaction: $$\ce{2 H2 (g) + 2 NO (g) -> N2 (g) + 2 H2O (g)}$$ The elementary steps of this reaction are: $$ \begin{align} &1^\text{st}~\text{step:} &\ce{...
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0answers
24 views

Why do acetate salts turn black on heating?

While performing the dry heating test during the qualitative analysis of white salt, a black residue indicates the presence of Acetate anionic radical. What is the underlying reaction/process behind ...
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1answer
26 views

How is traditional thermite powder stored such that it doesn’t corrode?

I watched some guy talk about redox reactions. Then he was going to do the good old thermite demonstration. He just had a bottle of thermite mixture. I’m wondering, why didn’t it have a chance to ...
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1answer
42 views

Can i breathe pure oxygen gas? [duplicate]

Sorry for the irrelevant tag because I was unable to find An appropriate one .Suppose there is a vaccum chamber and i filled completely with O2 without any traces of any other gases . Can a normal ...
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1answer
114 views

Why is lead(II) present in two groups of cation analysis? [closed]

Well, I found that lead cation $\ce{Pb^2+}$ is present in both group 1 and group 2 of cation analysis. But why?
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1answer
22 views

Thermal decomposition of group 2 permanganates [closed]

Do group 2 permanganates produce manganates via thermal decomposition?
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0answers
18 views

Enhance my chemistry knowledge [duplicate]

I am a computer engineer with some solid background in chemistry and physics (stoichiometry, quantum physics, thermodynamics, organic chemistry, periodic table, bonds and ions, redox reactions, etc.) ...
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0answers
38 views

On what factors do melting and boiling points depend upon?

In my book there is a separate discussion given for trends in melting and boiling points in each chapter in inorganic chemistry (the chapters on the various groups like group 15, group 16, etc.) and ...
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2answers
32 views

Is the reaction involving a proton transfer a redox reaction?

$$ \begin{align} \ce{H2S (aq) + NH3 (aq) &→ NH4+ (aq) + HS- (aq)}\tag{1}\\ \ce{Pb(s) + 2 FeCl3 (aq) &→ 2FeCl2 (aq) + PbCl2 (aq)}\tag{2} \end{align} $$ Which of the following statements ...