(i) Write two postulates of Werner's coordination theory. (ii) Draw the geometrical isomers of [(NH_3)_3(NO_2)_3] and give their structures.
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Key Points:
Werner explained coordination compounds using primary and secondary valencies.
Octahedral complexes of type \(MA_3B_3\) show two geometrical isomers:
fac (facial) and mer (meridional).
fac → three identical ligands on one face; mer → arranged along a meridian.