Wednesday, April 13, 2022
Although [Fe(CN)6]4- is more stable (EAN-36) than [Fe(CN)6]3-(EAN-35) as par EAN rule but actually [Fe(CN)6]3 is more stable than [Fe(CN)6]4- ?
Although [Fe(CN)6]4- is more stable (EAN-36) than [Fe(CN)6]3-(EAN-35) as par EAN rule but actually [Fe(CN)6]3 is more stable than [Fe(CN)6]4- because in Fe+3 Zeff will be more hence bonding between Fe+3 and -CN is more effective.
Related Questions;
(1) What type of ligands are known ?
(4) What are the chemical formula and chemical name of Glauber salt ?
Which complex is more stable [Ni(CN)4]4- or [Ni(CN)4]2- and why?
In general stability of Complexes is directly proportional to the magnitude of charge on central metal atom. Thus Complexes of Ni +2 are more stable than Ni0
[Ni(CN)4]4- < [Ni(CN)4]2-
Related Questions;
(1) What type of ligands are known ?
(4) What are the chemical formula and chemical name of Glauber salt ?
d3s Hybrization and it's examples.
d3s Hybridization or dxy+dyz+dxz+s possess tetrahedral geometry and bond angle 109'28'. And examples are as CrO2Cl2, CrO42-, MnO41-, MnO42-
VO43-, Cr2O72-
Chemical methods of purification/refining of metals:
These methods include the following methods :
(1) OXIDATIVE REFINING :
The method is used when the impurities present in the metal have a greater affinity for oxygen and are more readily oxidized than the metal. Then these oxides may be removed as follows
(A) These oxide may form a scum on the surface of the metal. This scum can easily be removed by
skimming.
(B) If the oxides are volatile, they escape from the mouth of the furnace.
(C) The oxides may form a slag with the lining on the inside surface of the furnace and may thus be removed. In the formation of the slag, the lining acts as a flux.This method is usually employed for refining metals like Pb, Ag, Cu, Fe, etc. In this method the molten impure metal is subjected to oxidation by various ways.
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