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Boron
The only nonmetallic element in group 13, boron has a strong tendency to covalent bonding. It's lonely complex structural chemistry arises from the (2s)2(2p)1 configuration, which produce it one less valence electron than the number of orbitals in the valence shell. Simple compounds such as BCl3 have an incomplete octet and are strong Lewis acids, but boron usually accommodates its electron deficiency by forming clusters with multicenter bonding.
Boron is not a common element on the Earth overall (about 9 p.p.m. in the crust) but happens in concentrated deposits of borate minerals such as borax Na2[B4O5(OH)4].8H2O, associated with former volcanic activity or hot springs. It is used mostly as borates in enamels, glasses, detergents and cosmetics, and in lesser amounts in metallurgy.
Barg
This of the following is an electrovalent linkage: (1) CH 4 (2) MgCl 2 (3) SiCl 4 (4) BF 3 Ans: MgCl
The azimuthal quantum number is related to: (1) Size (2) Shape (3) Orientation (4) Spin Ans: Shape
priming and foaming.
Common or trivial names of some organic compounds Compound Common name Compound Common name CH 4 Methane
C2H5OH -> CO2(g) + H2O(g)
Q. Explain laws of Electrolysis? Ans . A spontaneous reaction takes place by itself. Some redox reactions are not spontaneous. In a no n-spontaneous redox reaction ,
Iodometric Titrations and Iodimetric The reduction of free iodine to iodide ions and oxidation of iodide ions to free iodine takes place in these titrations. I 2 + 2e - →
The standard free energy change for a reaction is -212.3 kJ mol -1 . If the enthalpy of the reaction is - 216.7 kJ mol -1 , calculate the entropy change for the reaction.
Explain stereochemistry a) The stereochemistry is E. The Br has higher priority on one carbon stereocenter, but it has lower priority on the other. b) The stereochemistry is
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