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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.
Explain experimental evidence to demonstrate the existence of ferromagnetic domains. Temperature increases, thermal motion, or entropy, competes with ferromagnetic tendency for
achiral vs diastereomers
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The allylic carbons are indicated with an asterisk (*).
Illustrate the salient aspects of ionic and metallic bonded crystals. Properties Ionic Metallic Bonding Force The
Q. Determine the frequency of light wave? Ans. The wavelength of red light is 7.0 x 10 -7 m. What is the frequency? c = λv The first thing to remember here is that
Q. Show the Halides of Aluminium? All the four trihalides of aluminium, i.e. AIF 3 , AICI 3 ,, AlBr 3 , and AlI 3 , are known. AIF 3 , is made by treating Al 2 0 3 with HF ga
show work is path function
gattermann koch reaction mechanism
Predicting the feasibility of reaction and does not show the rate of chemical reaction
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