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Q. Occurrence of group 13 element?
Both boron and aluminium have a high affinity for oxygen, so neither of them is found native. Boron occurs principally in the earth's crust as boric acid, H3B03 and as borates, such as, borax, Na2B407-10H20, kernite, Na2B407.4H20 and colemanite, Ca2B,6011.5H20. Aluminium is the most abundant metal (8.13%) in the earth's crust and is the third most abundant element, next only to oxygen (46.6%) and silicon (27.7%)). It occurs widely in the complex alumino-silicates, such as, clay from which, however, it cannot be extracted economically. The important ores of aluminium are bauxite, Al2,03,-xH20, where x = 1-3, cryolite, Na3Fl6, and corundum, Al203;. Gallium (1.9 x 10-3%), indium\(2.1 x lod5%) and thallium (7.0 x 105%)) are much less abundant than aluminium. Gallium and indium are found in aluminium and zinc ores. But even the richest sources contain less than 1% gallium and still less indium. Thallium is widely distributed in nature and occurs in sulphide ores of zinc, lead, copper and iron.
how does a atomic absorption spectrometer work?
Q. Development of off-flavours and objectionable taste in fats? Autoxidation leads to the development of off-flavours and objectionable taste in fats. The initial oxidation pro
synthesis of an aldehyde from an alkyl halide with 1C chain extension
What are distinguishing characteristics of metallic bonding? Metallic state can be visualized like an array of positive ions, with a common pool of electrons to
Name the products obtained on complete hydrolysis of DNA. Enumerate the structural differences between DNA and RNA. In what way is a nucleotide dissimilar from a nucleoside?
YES,LiAlH 4 be used to reduce nitro group to amino group in hydrogenation
While solving lime sida numericals we calculate CACO3 equivalent .In this we do conc. In ppm×100/mol. Wt. ssomewhere we multiply 2 × m. Wt .so wht 2
how do you name covalent bonds?
240 g of water at 20 degree C are mixed with a sample of iron at 500 degree C. The final temperature of the system is 42 degree C. Find the mass of the iron sample
General Anesthetics: General Anesthetics depress the central nervous system to like an extent that all sensitivity to pain or feeling is gone, that is they make unconsciousnes
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