Questions tagged [boron-family]

For questions about the elements of the boron family (group 13), their compounds, and their physical and chemical properties.

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Electrophilic substitution on Borazole

As Borazole ($\ce{B3N3H6}$) is aromatic, it shows electrophilic aromatic substitution. Now, my question is when borazole undergoes electrophilic aromatic substitution reaction, on which atom does the ...
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1answer
209 views

What is the hybridisation of the bridging oxygen atoms in the borax anion?

Below is a neat looking borax anion. While exploring the molecule in a computer simulation (Gaussian 16, level of theory: HF/3-21G), I found that the oxygen atoms in the 8-membered outer ring had sp2 ...
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1answer
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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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How many moles of crystallization water are present in one mole borax ?? 8 or 10? [duplicate]

How many moles of water of crystallization present in per mole of borax ?? Borax is $\ce{Na2BO7.10H2O}$. This suggests that number of moles of water of crystallization is 10 [And after removing these ...
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2answers
136 views

Acidic nature of boric acid when its concentration high

Following statement was given for boric acid $(\ce{H3BO3}):$ At low concentrations $(\leq\pu{0.02 M})$ essentially $\ce{B(OH)3}$ and $\ce{B(OH)4-}$ are present, but at higher concentration the ...
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1answer
245 views

Structure of crystalline boron trioxide

I recently came across the statement The structure of crystalline $\ce{B2O3}$ consists of $\ce{BO4}$ tetrahedra, two sets of which form two types of interconnected spiral chains, three $\ce{B-O}$ ...
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Relative Energies of Resonance Contributors & Stability of Borazine

We know that Borazine (Inorganic Benzene) is aromatic in nature. The following image shows the resonance contributors of borazine: What are the relative energies of these three resonance contributors?...
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1answer
662 views

Why are bridge bonds weaker than terminal bonds and, H-B-H terminal bond angles larger than H-B-H bridging bond angles in diborane? [duplicate]

In Concise Inorganic Chemistry by J.D.Lee (Adapted by Sudarsan Guha, Fourth Edition), on page 83, under the topic "Bridge Bonding" it is given for diborane $(\ce{B2H6}):$ The $d_\ce{B-H}(\...
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452 views

Why are B-O-H and B-O-C angles in B(OH)3 and B(OCH3)3, respectively are higher than normal?

In Concise Inorganic Chemistry by JD Lee (4th edition; adapted by Sudarshan Guha), page 77 under the topic "Back Bonding" it is given: The $\mathrm{2p}\pi$-$\mathrm{2p}\pi$ back bonding in $\ce{B(...
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Creation of BF3 from B2O3 [duplicate]

Why can't you prepare Boron Trifluoride by reacting B2O3 with Carbon and Fluorine? B2O3 + 3C + X2 ---> 2BX3 + 3CO Why won't this work with Fluorine? (This is not a duplicate, as the question being ...
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1answer
408 views

Which is more metallic: boron or silicon?

I read somewhere that boron is more metallic. Is it correct? If so, can you please elaborate? The reason why I'm confused is because 2 factors come into play here: When you move towards right, ...
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Can ethylene glycol enhance the acidity of orthoboric acid?

My textbook says: Boric acid is a weak monobasic acid but on addition of certain organic polyhydroxy compounds, such as mannitol, glycerol, dextrose or invert sugar, it is transformed into a ...
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2answers
844 views

Oxidation states of boron

I have just been looking at https://en.wikipedia.org/wiki/List_of_oxidation_states_of_the_elements and found that boron has a -5 oxidation state. I would like to know which boron compounds form ...
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Why is the electronegativity of indium greater than that of thallium?

Why is the electronegativity of indium greater than that of thallium? One possibility which I had assumed was the poor shielding effect by the d and f orbitals which leads to an increase in the ...
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Structure of trichloroborazine

I came across a question that asked the correct structure of trichloroborazine. The two options provided were : a) the chlorine atoms attached to the three N atoms, and b) the chlorine atoms ...
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606 views

Why isn't orthoboric acid soluble in cold water even though it has polar B-OH bonds?

This is the information I found regarding orthoboric acid's solubility: Textbook (NCERT India): Sparingly soluble in water (didn't say what temperature - presumably cold) and highly soluble in hot ...
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3answers
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Why does screening effect decrease due to d-orbital?

In 13th group, atomic radius increases from boron to aluminium. From aluminium to gallium, atomic radii decreases. From gallium to indium, atomic radii increases. And from indium to thallium, atomic ...