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Questions tagged [pnictogen]

For questions about the group 15 elements — nitrogen, phosphorus, arsenic, antimony, and bismuth: their synthesis, or physical and chemical properties.

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Why there is no P−O−Cl bond in phosphoryl chloride?

Why is the structure of $\ce{POCl3}$ not like the left? I know the elements in period 3 or higher don’t have to follow the octet rule, but the left structure doesn’t seem to have any problems:
Kodori's user avatar
  • 21
0 votes
1 answer
125 views

Why is phosphoric acid a weak acid?

What is the reason for the phosphoric acid $\ce{H3PO4}$ being a weak acid despite having a structure similar to that of sulfuric acid $\ce{H2SO4}?$ I found some sources claiming that the resonance of ...
Kampann's user avatar
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7 votes
2 answers
191 views

Synthesizing Cyclotetrazane from Hydrazine and Diazene?

Could cyclotetrazane — a compound with nitrogen atoms arranged in a square configuration — be synthesized? A hydrogen atom would be bonded to each vertex (nitrogen atom): Could cyclotetrazane be made ...
Nitrogen-8's user avatar
0 votes
1 answer
134 views

Non-octet structures of stable nitrogen compounds

A question in my exercise book demonstrates that nitrogen cannot form non-octet structures since the most common examples — nitrogen dioxide and nitrogen monoxide — are unstable/reactive. For example, ...
Freeby Freeby's user avatar
5 votes
1 answer
308 views

Why is pyramidal structure observed in trisilylphosphine?

Why does trisilylphosphine $\ce{P(SiH3)3}$ (ICSD Entry: 72676, [1]) have a pyramidal structure while trisilylamine $\ce{N(SiH3)3}$ (ICSD Entry: 201428, [2]) is planar? I think since silicon has a ...
Substitute_Y's user avatar
6 votes
1 answer
491 views

Why does phosphinic acid not form pyroacids?

Why does $\ce{H3PO2}$ not form pyroacids? All I know is pyroacids are derived oxyacids obtained by removing one $\ce{H2O}$ molecule from two molecules of oxyacids. Correct me if this is wrong.
Mathlover12345's user avatar
11 votes
2 answers
2k views

Is "pentel" a real chemistry term?

Allegedly "pentel" is a synonym for "pnictogen," that is, an element of group 15, the nitrogen group. However, I have not been able to find any sources to support the existence of ...
Sam Kauffman's user avatar
4 votes
2 answers
286 views

What is the number of acidic hydrogens and the n-factor of hypophosphorous acid?

My teacher said that the hydrogen which is directly linked with oxygen or more electronegative atom is an acidic hydrogen, and that the $n$-factor for an acid is the number of acidic hydrogens. Then ...
Nipun Kulshreshtha's user avatar
3 votes
2 answers
304 views

Reaction between sodium hydroxide and phosphorus trioxide

My chemistry textbook [1], chapter Periodic Properties of Elements, section p-Block elements — formation of oxides suggests that the reaction is $$\ce{P2O3 + 2 NaOH -> 2 NaHPO3},\tag{R1}$$ but ...
Nazmul Hasan Shipon's user avatar
2 votes
1 answer
1k views

Can aqua regia/royal water dissolve lead? [duplicate]

As known aqua regia can't dissolve $\ce{Ag}$ because formation of $\ce{AgCl}$ precipitate. Similarly will aqua regia precipitate $\ce{Pb}$ as $\ce{PbCl2}$? OR It is not possible to observe this ...
Jay's user avatar
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Electron Affinity of Lead as compared to Bismuth

For "nitrogen family" and "carbon family" the trend goes that in a period, the electron affinity in case of group 15 is less than that of group 14. This is attributed to the half-...
Gurjot Singh's user avatar
3 votes
1 answer
785 views

Balancing redox reaction of zinc and hot diluted nitric acid

I need to balance the following reaction: $$\ce{Zn + HNO3 -> Zn(NO3)2 + NH4NO3 + H2O}$$ I assigned all oxidation numbers: $$\ce{\overset{0}{Zn} + \overset{+1}{H}\overset{+5}{N}\overset{-2}{O_3}\...
Xetrez's user avatar
  • 217
3 votes
2 answers
2k views

Reactivity of group 13 elements with nitrogen

Do all group 13 elements react with nitrogen to form nitrides of form $\ce{MN}?$ J.D. Lee's Inorganic chemistry book mentions the following: Aluminium burns in dinitrogen at high temperatures ...
Ashish's user avatar
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0 answers
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What is the correct Lewis structure of difluorophosphate?

I can draw two possible Lewis structures for $\ce{PO2F2-}$ anion: What is the correct structure and why is the other one wrong?
donthababakka's user avatar
2 votes
1 answer
3k views

Oxidation State of Nitrogen in N2O

If we try to calculate the oxidation state of nitrogen in $\ce{N2O}$ using the familiar algebraic method, we get oxidation state $+1$ for both nitrogen atoms and that's what I found when I looked it ...
Physicsa's user avatar
3 votes
0 answers
542 views

Why do nitrogen-containing organic compounds give N2 as the combustion product?

My teacher gave the explanation stating that consider that first the nitrogen in lower state is oxidised to $\ce{N2}$ and then the further oxidation would stop as the $\ce{N-N}$ bond energy of $\ce{N2}...
Govind's user avatar
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0 answers
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How to measure purity of nitrogen gas in a "homemade" way?

Is there any indicator or a way of measuring purity of nitrogen? The lab-way of doing things is out of my reach and I was thinking about a DIY way. I want to decrease oxidising atmosphere in a ...
Hvitis's user avatar
  • 111
4 votes
2 answers
525 views

Lewis structure of dinitrogen trioxide

I have a confusion related to the structure of $\ce{N2O3}.$ I was taught 1 is the correct one, but I believe 2 is better since it has no formal charge on it. Why is 1 correct and 2 wrong?
Rasputin's user avatar
  • 107
1 vote
1 answer
158 views

Is there a crystal structure of ammonia in ionic form?

Like solid $\ce{PCl5}$, does solid $\ce{NH3}$ exist as $\ce{[NH4+][NH2-]}$ (i.e. ammonium amide)?
Gopai Mukherjee's user avatar
3 votes
2 answers
2k views

Do metals react with ammonia gas (not liquid phase)?

In my chemistry notes I have two chemical equations as follows: $$ \begin{align} \ce{2 NH3(g) + 6 Li(s) &-> 2 Li3N(s) + 3 H2(g)}\tag{R1} \\ \ce{2 NH3(g) + 2 Na(s) &-> 2 NaNH2 + H2(g)}\...
Yousuf Ithfi's user avatar
3 votes
0 answers
82 views

Structure of dihydrogen peroxy-phosphate ion

In structure of Dihydrogen peroxy-phosphate ion $\ce{H2PO5-}$, shouldn't negative charge be on oxygen linked directly to phosphorus, rather than on oxygen linked through peroxy linkage with another ...
Zenix's user avatar
  • 1,350
3 votes
1 answer
720 views

n-Factor of P4O6 [closed]

I had a question in my exam: Which of the following can be the $n$-factor of $\ce{P4O6}?$ A. 8 B. 9 C. 10 D. 12 I went for options A and B as in cold water $1$ mole of $\ce{P4O6}$ on hydrolysis give ...
Zenix's user avatar
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1 vote
1 answer
1k views

Why doesn't hydrazine contain a double bond between two nitrogen atoms? [closed]

I know that the Lewis structure of hydrazine contains $\mathrm{sp^3}$ hybridized nitrogen atom but on analyzing it's structure I realized there are many bond pair and lone pair repulsions. Instead of ...
Kartik Aggarwal's user avatar
3 votes
0 answers
120 views

Bond lengths in P₄O₁₀

According to JD Lee's Concise Inorganic Chemistry: The double bond $\ce{P=O}$ in $\ce{P4O10}$ contains p(π)–d(π) backbonding, where a full p-orbital on oxygen overlaps with an empty d-orbital on $\...
vishesh jain's user avatar
2 votes
1 answer
1k views

Argon vs nitrogen for preserving wine

I have a question regarding whether argon or nitrogen is to prefer when it comes to preserving wine. Specifically, I am interested in knowing if there is a difference in preservation periods. Also, ...
Martin Beyer's user avatar
10 votes
4 answers
5k views

Structure of pyrophosphorous acid

What is the structure of pyrophosphorous acid? I asked this question here because the answer which I found on web and other resources are inconsistent which each other. For example, following data is ...
xrfxlp's user avatar
  • 323
1 vote
2 answers
3k 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 ...
David Wax's user avatar
20 votes
2 answers
630 views

Does CN4 with the following structure exist?

I am a mathematician, not a chemist, so my questions are rather combinatorial. I am intrigued by the possibility of the following binary compound: $$\ce{\overset{-}{N}=\overset{+}{N}=C=\overset{+}{N}=\...
Thomas Forster's user avatar
4 votes
1 answer
764 views

Why is (tri-)ammonium phosphate ((NH4)3PO4) so unstable?

Why is triammonium phosphate, $\ce{(NH4)3PO4}$, so much more unstable than diammonium phosphate, $\ce{(NH4)2HPO4}$, or monoammonium phosphate, $\ce{NH4H2PO4})$?
Bombatta3's user avatar
2 votes
1 answer
2k views

Why does the stability of hydrides decrease down the group in nitrogen family?

Why does the stability of hydrides decrease down the group in nitrogen family? Does this have to do with the fact that $\ce{NH3}$'s $\ce{N}$ is hybridised ($\ce{sp^3}$) while the rest of the group ...
Archer's user avatar
  • 5,511
3 votes
0 answers
4k views

Decomposition of phosphine solution in water when exposed to sunlight

Quoting from my chemistry textbook: The solution of phosphine in water decomposes in presence of light giving red phosphorus and hydrogen gas. I could not find any relevant details on the Internet....
CodeBlooded's user avatar
11 votes
1 answer
4k views

Why is the standard enthalpy of formation of black phosphorus not zero? [duplicate]

Black phosphorus is the most stable allotrope of phosphorus. Then why is its standard enthalpy of formation not taken as zero?
Nikita's user avatar
  • 113
9 votes
3 answers
4k views

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.
Avi khare's user avatar
  • 199
3 votes
2 answers
8k views

Why doesn't nitric oxide react with water?

Why doesn't $\ce{NO}$ (nitric oxide) react with water? I know it is a neutral oxide, but I'm really curious as to why that is. Why will $\ce{NO}$ not react with $\ce{H2O}$?
nora's user avatar
  • 41
0 votes
1 answer
2k views

How can I calculate the percentage of dissociated dinitrogen tetroxide?

When $\pu{36.8 g}$ $\ce{N2O4(g)}$ is introduced into a 1.0-litre flask at $\pu{27 °C}$ the following equilibrium reaction occurs: $\ce{N2O4(g) <=> 2NO2(g)}$; $K_p = 0.1642~\mathrm{atm}$. Find ...
user123733's user avatar
2 votes
1 answer
8k views

Lewis structure of nitric oxide

These are the two resonating structures of $\ce{NO}$ given in my textbook: $$\ce{:\!N=\overset{\Large .\!\!.}{\underset{\Large .}{O}}\!: <-> :\!\overset{\Large .}{N}=\overset{\Large .\!\!.}{O}\!...
Arishta's user avatar
  • 4,227
6 votes
1 answer
6k views

Oxidation state of nitrogen in HN3

The book asks me to find the oxidation state of nitrogen in the compound below (the structure is not the one given in Wikipedia for HN3): To find the oxidation state using Lewis structure, I have ...
Aditya Dev's user avatar
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1 vote
0 answers
91 views

What is the correct order of boiling points for group 15 hydrogen compounds? [duplicate]

What is the order of boiling points of the following $\ce{NH3}$, $\ce{PH3}$, $\ce{AsH3}$, $\ce{SbH3}$ and $\ce{BiH3}$? What I thought was, that as $\ce{H2O}$ has a higher boiling point compared to ...
Adit Daftary's user avatar
15 votes
4 answers
21k views

Why is HNO3 a stronger oxidising agent than H3PO4?

Why is $\ce{HNO3}$ a stronger oxidising agent than $\ce{H3PO4}$? $\ce{N}$ and $\ce{P}$ have the same oxidation number. Is it the electronegativity difference between $\ce{N}$ and $\ce{P}$?
Ragnar's user avatar
  • 179
8 votes
1 answer
462 views

Nitrogen chain nomenclature

I know that nitrogen is versatile enough that it can form branched chains if it is all single bonds. For example: $\ce{H2N-N(NH2)-NH2}$ Is this compound a nitrane (nitrogen alkane)? If so how ...
Caters's user avatar
  • 2,111
4 votes
0 answers
200 views

Phosphorus and Boron groups

I know some sulfur groups such as sulfones and disulfides and sulfonic acids. I also know of 1 phosphorus group. That is the phosphate ion. I don't know of any boron groups. What is the phosphorus ...
Caters's user avatar
  • 2,111
5 votes
1 answer
4k views

When is phosphorus a polyatomic molecule?

Phosphorus is listed as a single element in the periodic table; however, I see that it is also a polyatomic molecule as $\ce{P4}$. I am trying to determine the number of atoms of phosphorus in an ...
LAG's user avatar
  • 117
4 votes
1 answer
24k views

Allotropy in Nitrogen and Bismuth of Group 15

Which elements of Group 15 of the periodic table have allotropes? P, As and Sb have well-known allotropes: P: White, Red and Black; As: Yellow, Black and Gray (Grey); Sb: White, Yellow and Black....
Del Pate's user avatar
  • 2,195
3 votes
1 answer
2k views

Which is the least stable trihalide of nitrogen?

Which is the least stable trihalide of nitrogen and why? I have two conflicting theories, one is that fluorine-fluorine electron repulsion will make $\ce{NF3}$ least stable and another is steric ...
Rajesh's user avatar
  • 794
39 votes
3 answers
45k views

Why does basicity of group 15 hydrides decrease down the group?

In my textbook it is written that the order of basic strength of pnictogen hydrides is $$\ce{NH3 > PH3 > AsH3 > SbH3 > BiH3}$$ I tried but could not find any explanation as to why this ...
Soham's user avatar
  • 1,283
4 votes
1 answer
13k views

Is the proper formula for phosphorus oxide(V) P4O10 or P2O5?

I would like to ask about formula of phosphorus oxide(V). Should it be $\ce{P4O10}$ or $\ce{P2O5}$? Which is right when I have to write the molecular formula?
mazix's user avatar
  • 143
6 votes
2 answers
920 views

What is the structure of N₅P₃?

What is the structure of the molecule $\ce{N5P3}$? $\ce{N5P3}$ is not documented online, so could anyone please comment on the structure of the molecule: How many ligands does each phosphorous atom ...
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