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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.
what is first transition series
The quantum numbers for the outermost electron of an element are given below as n= 1, l=0, m=0, s = 1/2 . The atoms is: (1) Lithium (2) Beryllium (3) Hydrogen (4)
Iodide ion is a good nucleophiles Because iodide ion is a good nucleophiles and the trimethyloxonium ion is an good alkylating agent, alkylation of the iodide ion occu
explanition
CAN BOHR MODEL EXPLAIN THE SPECTRUM LINE OH HYDROGEN ATOM?
(a) Define the so-called 'colligative' properties, and write brief notes about each of them. (b) A system comprises two liquid components. State whether the system would be lik
why they are called noble gases
Why transition elements form interstitial compound
In the transition of Zn atoms to Zn ++ ions there is a decrease in the: (1) Number of valency electrons (2) Atomic weight (3) Atomic number (4) Equivalent weight A
Definitions Oxidation exactly meant 'combination with oxygen' and reduction 'removal of oxygen'. These definitions have been illustrated. Oxidation implies combination with a
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