dear expert in the study material of coordination u have given the concept of basic thing and in example u have given about optical isomerism, nomenclature how we r able to understand

1- i m unable to understand soln of this question

The ratio of moles of AgCl precipitated on adding AgNO3to PdCl2.4NH3and CoCl3.4NH3, respectively, is

plz make me clear and explain the answer step by step

2- i have doubt that no2 exist at neutral and +1 form i m unable to understand which i have to take while calculating the oxi no and ean explain the logic behind this

Q- this is given in ncert exampler - when 0.1 mol cocl3(nh3)5 is treated with excess of agno3 o.2 mole of agcl are obtained find conductivity


  1. column1- co(nh3)6 3+ , ti(h20)6 3+, ni(h2o)6 2+, ni(h2o)4(en) 2+ aq

column 2- violet, green, pale yellow, yellowish orange, blue


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Complex Colour
[Co(NH3)6]3+ yellow
[Ti(H2O)6]3+ Violet
[Ni(H2O)6]2+ Green
[Ni(H2O)4(en)]2+ Pale blue

2. A complex compound consist of 2 valencies i.e. primary valency and secondary valency. Out of which primary valency which is satisfied by a species present outside the coordination sphere is ionisable and the secondary valency satisfied by ligands are unionisable. 
In case of PdCl2.4NH3, the structure of the complex is [Pd(NH3)4]Cl2. As two chlorine atoms are satisfying primary valency therefore they are ionisable.
 [Pd(NH3)4]Cl2 ---------> ​ [Pd(NH3)4]2+ + 2Cl-
On treatment of excess of AgNO3, it produces 2 mole of AgCl precipitate.
Case II
The structure of CoCl3.4NH3 is [Co(NH3)Cl2]Cl, which on dissociation produces 1 chloride ions
[Co(NH3)Cl2]Cl ------> ​[Co(NH3)Cl2]+ + Cl
Hence, it forms 1 mole of AgCl precipitate. 
Therefore, The ratio of moles of AgCl precipitate is 2 :1. 
3. In most of the cordination compounds NO2 exist as NO2- i.e. Nitrite ions.
Nitrite ions also exist as two isomers i.e. MNO2 ( Known as nitro) and MONO ( known as nitrito). In both the case NO2 ligand attains negative charge. 
However, In some exceptional cases NO2 also exist as NO2+ i.e. Nitronium ions. 
Generally nitonium ions are quite reactive and hence coordination compounds formed by NO2+ are less in number. 
Examples of some stable complex of NO2+ are NO2BF4, NO2PF6 etc. 

4. As 0.1 mol compound on treatement with AgNO3 forms 0.2 moles of AgCl, it means two chlorine atoms are present outside the coordination sphere.
Therefore, CoCl3(NH3) exist as [Co(NH3)5Cl2]Cl.
Dissociation of the above compound is as follow:
[Co(NH3)Cl5]Cl2 ---------> [Co(NH3)5Cl] +  + 2Cl-
Which means the given compound form 3 particles i.e. 1 postivelty charged and 2 negitively charge particles.
Hence, the comductivity of compound corrosponds to 1:2 electrolyte. 


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