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what is an inorganic benzene? 2) Lanthanoid contraction is due to increase in which factor of atom? 3)What is the use of ferrosilicon in steel industry? 4)What is the product when benzaldehyde condenses with N,N-dimethylaniline in presence of anhy. ZnCl2 ?
Benzene is an organic chemical compound with the molecular formula C6H6. Its molecule is composed of 6 carbon atoms joined in a ring, with 1 hydrogen atom attached to each carbon atom. Because its molecules contain only carbon and hydrogen atoms, benzene is classed as a hydrocarbon.

Benzene is a natural constituent of crude oil, and is one of the most basic petrochemicals. Benzene is an aromatic hydrocarbon . Benzene is a colorless and highly flammable liquid with a sweet smell. It is mainly used as a precursor to heavy chemicals, such as ethylbenzene and cumene, which are produced on a billion kilogram scale.

 2.The steady decrease in the size of the atoms and ions of the rare-earth elements (rare-earth element) with increasing atomic number from lanthanum (atomic number 57) through lutetium (atomic number 71). For each consecutive atom the nuclear charge is more positive by one unit, accompanied by a corresponding increase in the number of electrons present in the 4f orbitals surrounding the nucleus. The 4f electrons very imperfectly shield each other from the increased positive charge of the nucleus, so that the effective nuclear charge attracting each electron steadily increases through the lanthanoid (lanthanide) elements, resulting in successive reductions of the atomic and ionic radii. The lanthanum ion, La3+, has a radius of 1.061 angstroms, whereas the heavier lutetium ion, Lu3+, has a radius of 0.850 angstrom. Because the lanthanide contraction keeps these rare-earth ions about the same size and because they all generally exhibit the +3 oxidation state, their chemical properties are very similar, with the result that at least small amounts of each one are usually present in every rare-earth mineral. The lanthanide contraction also is a very significant factor in the extremely close chemical similarity of zirconium  Because of the lanthanide contraction, heavier hafnium, which immediately follows the lanthanoids, possesses a radius nearly identical to the lighter zirconium.

3. Ferro-silicon is the most widely used deoxidising agent in the steel industry,often used as a heating agent cap  inorder to improve the quality and recovery. (2) used in the iron industry and the ball inoculant agent.
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