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NOBEL GASES
With their closed-shell electron design the noble gas elements of group 18 were long regarded as chemically inert. However, in 1962 Bartlett pinpoint that the ionization energy of xenon was same to that of O2, and by reaction with PtF6 attempted to build the compound analogous to [O2]+[PtF6]-. He collect a complex product having the ion [XeF]+ rather than the required Xe+. Many substance of xenon are now known, widely with O and F, and few of krypton.
The gases are not usually abundant on Earth, although argon (formed by the radioactive decay of 40K) built up helium (formed by radioactive decay of uranium and thorium and about 1 mol % of the atmosphere occurs in natural gas. Radon is radioactive, 222Rn have a half-life of 3.8 days also being produce by radioactive decay from 238U. The boiling points of the elements display the trend expected from van der Waals' forces, that of helium (4.2 K) being the lowest of any element. Helium is also single as it does not solidify except under pressure; the remaining substance form monatomic solids with close-packed structures. Liquid helium is required for maintaining very low temperatures, argon as an inert gas in different metallurgical processes, and all the substance in gas discharge tubes.
Sketch the various n-butane and discuss their relative stabilities.Draw the potential energy curve as a function of torsion angles.
The number of orbitals in the fourth principal quantum number will be: (1) 4 (2) 8 (3) 12 (4) 16 Ans: 16
Chain, nuclear or skeleton isomerism: This form of isomerism arises because of the difference in the nature of the carbon chain (that is straight or branched) which makes the
In polar covalent molecule, one atom gets positive charge and the other one takes negative charge as known as dipole.
describe the reaction and constitution of glucose.
Plant-based Sources of Antioxidants I. Vitamin C (ascorbic acid) - blackcurrants, green peppers, guava, gourds, greens, strawberries, kiwi fruits, citrus fruits, paw - paws
Halides and halide complexes Almost all elements create thermodynamically stable halides. The general stability sequence is F>Cl>Br>I, that in covalent compounds follows the su
what are the principle underlying the extraction of metals
A hydrocarbon z with molecular mass 78 on combustion gave 3.384g of carbon (IV) oxide and 0.693g of water. Determine the molecular formula of Z and draw its structure. [H=1, C=12,
Explain the qualitative analysis of the basis radical using the concept of solubility, solubility product and common ion effect?
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