The coordination number of Thorium (Th) in the complex Mg[Th(NO3)6] and the geometry/shape of the complex ion respectively are:

Match List I with List II: List I (Complex): A. [Pt(NH3)2Cl2] B. [Co(en)3]3+ C. [Co(NH3)5NO2]Cl2 D. [Cr(H2O)6]Cl3 List II (Type of isomerism): I. Optical II. Solvate III. Geometrical IV. Linkage Choose the correct answer from the options given below:

Which one of the following is an ambidentate ligand?