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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.

4
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4answers
392 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 ...
0
votes
2answers
125 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 ...
9
votes
0answers
113 views

Does this binary compound of C and N - isoelectronic with carbon suboxide - exist?

I am a mathematician not a chemist, so my questions are naive and rather combinatorial. I am intrigued by the possibility of the following compound: $$\ce{N- = N+ = C = N+ = N-}$$ which ought to ...
4
votes
1answer
313 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, $\ce{NH4H2PO4})$?
2
votes
1answer
483 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 ...
1
vote
1answer
874 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....
8
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1answer
2k 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?
3
votes
2answers
2k 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 $\ce{H2O}$?
1
vote
0answers
69 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 ...
9
votes
1answer
365 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 ...
4
votes
0answers
159 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 ...
5
votes
1answer
2k 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 ...
3
votes
1answer
15k 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....
3
votes
1answer
1k 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 ...
20
votes
5answers
12k 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 ...
6
votes
2answers
416 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 ...