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D Devendra Khairwa
The order of the wavelength of absorption will be decided from the order of their CFSE values. The CFSE values increase in the order :-            H2O < NH3 < NO2 -  Hence, the order of wavelengths of absorption in the visible region is    :              [Ni(H2O)6]2+ > [Ni(NH3)6]2+ > [Ni(NO2)6]4-  

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D Devendra Khairwa
We know that due to the chelation effect stability of the chelating compound is more than the simple compound.  Thus it is easy to notice that    is most stable among all given compounds.

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D Devendra Khairwa
(i) No. of unpaired electrons in  is 3.                  The magnetic moment is given by :                                                                             or                                                                        (ii) Similarly in    the number of unpaired electrons is 4.                  So the magnetic moment :                                                       ...

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D Devendra Khairwa
In the metal extraction process of metals, like silver and gold, make use of complex formation. For example, gold combines with cyanide in the presence of oxygen and water to form the coordination entity [Au(CN)2 ]  in aqueous solution which can be further separated by addition of zinc.

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D Devendra Khairwa
(iii) In analytical chemistry, the familiar colour reactions given by metal ions with a number of ligands generally chelating ligands. The formation of coordination entities gives the basis for their detection and estimation by classical and instrumental methods of analysis.

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D Devendra Khairwa
The role of coordination compounds in the medicine industry is very huge such as the use of chelate therapy in medicinal chemistry. The excess of copper and iron are removed by the chelating ligands D–penicillamine and desferrioxamine B via the formation of coordination compounds. Nowadays,  some coordination compounds of platinum (such as cis–platin and related compounds) effectively inhibit...

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D Devendra Khairwa
Coordination compounds play a great role in biological systems. The pigment which is responsible for photosynthesis, chlorophyll, is a coordination compound of magnesium. Haemoglobin (which acts as oxygen carrier) the red pigment of blood is a coordination compound of iron. Vitamin B12, cyanocobalamine, the anti-pernicious anaemia factor, are few coordination compounds of cobalt which have...

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D Devendra Khairwa
When a ligand is attached to the metal ion in such a manner that it forms a ring-like structure, then the metal-ligand bond is found to be more stable i.e.,  complexes containing chelate rings are more stable than complexes without rings. The formation of such rings is known as the chelate effect.                                                        

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D Devendra Khairwa
In ground state,Ti has 23 electrons with electronic configuration 3d34s2. The oxidation state of Ti in the given compound is +3. Hence it will now have the configuration 3d2. Since it has 2 unpaired electrons and has the ability to undergo d-d transition, the given complex gives violet colour.

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D Devendra Khairwa
The IUPAC name of the given compound is Potassium hexacyanomanganate(II). The oxidation state of Mn in this compound is +2.  The electronic configuration is d5. The coordination number of this compound is 6. The magnetic moment of a compound is given by :                                                                                                                          Here n is the number...

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D Devendra Khairwa
The IUPAC name of the given compound is Caesium tetrachloroferrate (III). The oxidation state of Cs in this compound is +3.  The electronic configuration is d5. The coordination number of this compound is 4. The magnetic moment of a compound is given by :                                                                                                                          Here n is the number...

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D Devendra Khairwa
The IUPAC name of the given compound is Trichloridotripyridinechromium (III). The oxidation state of Cr in this compound is +3.  The electronic configuration is d3. The coordination number of this compound is 6. The magnetic moment of a compound is given by :                                                                                                                          Here n is the...

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D Devendra Khairwa
The IUPAC name of the given compound is Pentaamminechloridocobalt(III) chloride. The oxidation state of Co in this compound is +3.  The electronic configuration is d6. The coordination number of this compound is 6. The magnetic moment of a compound is given by :                                                                                                                          Here n is the...

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D Devendra Khairwa
The IUPAC name of the given compound is Potassium diaquadioxalatochromate (III) trihydrate. The oxidation state of Cr in this compound is +3.  The electronic configuration is 3d3. The coordination number of this compound is 6. The magnetic moment of a compound is given by :                                                                                                                         ...

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D Devendra Khairwa
(iv)  In the given complex compound the oxidation state of Mn is +2. Also, the coordination number of Mn is 6. The d orbital occupation for the central metal ion Mn+2 is t2g3 eg2.

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D Devendra Khairwa
(iii) The oxidation state of Co in the given coordination compound is +2. Also, the coordination number of Co is 4. The d orbital occupation for the central metal ion Co2+ is eg4 t2g3.

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D Devendra Khairwa
(ii) The oxidation state of Cr in the given complex is +3. The coordination number of Cr is 6. The d orbital occupation for central metal ion Cr3+ is t2g3.

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D Devendra Khairwa
The metal-carbon bond in metal carbonyls has both σ and π character. Basically the M–C σ bond is generated due to the donation of lone pair of electrons on the carbonyl carbon into a vacant orbital of the metal. Whereas the M–C π bond is formed due to the donation of a pair of electrons from a filled d orbital of metal into the vacant/empty antibonding π* orbital of carbon monoxide. As a...
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