Explanation
Chelates are more stable than non – chelated compounds of comparable composition and the more extensive the chelation – i.e., the larger the number of ring closures to a metal atom, the more stable the compound. Therefore five fused cyclid system is most stable for a chelate.
Dichlorodioxalato chromium (III) [Cr(Cl)2 (Ox)2]3- . In a complex primary valency of metal is the oxidation number of metal and the secondary valency of the metal is the coordination number.Therefore primary valancy and secondary valancy of chromium in complex is +3 and +6 respectively.
[COCl3(NH3)3] does not ionise and does not give precipitate of AgCl
The tetrahedral complexes have coordination number 4. Because in these complexes the number of bonds formed between metal and ligand are 4.
In [Pt(NH3)6]Cl4 which is a hexaammine platinum(IV) chloride. It has HCl – ions (free ions) and cation ([Pt(NH3)6]+). Hence it has total 5 electrons in the solution.
Osmium has atomic number 76 . If forms compounds with oxidation states ranging from -2 to +8 . The most common oxidation states are +2 , +3 ,+4 and +8.
Hence, the coordination number of an osmium complex may increase to 8.
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