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Q. Show Occurrence Extraction of group 16?
Oxygen is the most abundant of all elements on earth. Dry air contains 20.946% oxygen by volume in the free form. Oxygen forms about 46.6% by weight df the earth's crust including the oceans and the atmosphere. Most of this combined oxygen is in the form of silicates. oxides and water. Water is one of the most abundant compounds on earth, present not only in oceans which cover three fourths of the earth's surface but also in the atmosphere as vapour and in the subterranean aquifers. Living organisms also contain large amounts of water. Water contains 88.8% of oxygen by weight.
By contrast, the abundance of sulphur in the earth's crust is only 0.03-0.19. It is often found as the free element near volcanic regions in japan. Sicily , Mexico and Luisiana in USA. Combined sulphur exists primarily in sulphates and sulphides. Such as gypsum. Ca SO4,. 2H2O. barite, BaSO4,, and epsom salt. MgSO4, 7H2O. The sulphides include galena. PbS. zinc blende. ZnS. chalcopyrite CuFeS2,. Iron pyrite. FeS2 and cinnabar. Hg S. etc It also occurs in mineral springs as H2S. Along with C. H. 3. N and P, sulphur is one of the twenty-three odd elements essential for life. It is a constituent of substances such as eggs, wool, hair and also mustard, garlic, cabbage, etc. Selenium and tellurium also occur as sulphide ores. Polonium occurs naturally as a decay product in thorium and uranium minerals.
How to write chemical formula of hydrogen peroxide
Q. What is Electronic Isomerism? Electronic Isomerism: The complex {Co (NH 3 )sNO]Cl 2 exists in two forms. One is black paramagnetic while the other is pink and diamagnetic
Is it the key or the lock of the lock and key model? Ans) The activation center is a region of the enzyme formed by its spatial conformation to which the substrate binds. In the
The total number of valence electrons in 4.2 gm N - 3 of ion is ( N A is the Avogadro's number): (1) 1.6N A (2) 3.2N A
Q. Show the Effect of concentration on Chemical Equilibrium? Ans. When more of one of the chemicals is added to the reaction, more collisions take place moving the reactio
How many unpaired electrons in Fe (II)?
The fresh feed to an ammonia production process contains nitrogen (N 2 ) and hydrogen (H 2 ) in stoichiometric proportion, along with an inert gas (I). The feed is combined with
Its Tetrahedral ( 4 sigma bonds )
What is the Bond Order of Li(2)(minus) anion molecule? Ans) No. of bonding elecrtons =3 (valence), anti bonding =0 (given its state) thus =bond order =3/2=1.2
Write the formula and name the example of k peroxide
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